20 more dead, 450 injured as new round of explosions rocks Lebanon: Health officials

LONDON -- At least 20 more people were killed and 450 injured in Lebanon on Wednesday after a series of new explosions of wireless devices rocked the South, the Bekaa and the southern suburbs of Beirut, according to the Ministry of Health and the Lebanese Red Cross.

Ten Hezbollah members were among those killed on Wednesday, the group confirmed.

More than 30 ambulances are providing treatment and evacuations to wounded people in Lebanon on Wednesday, the Lebanese Red Cross said. At least 95 people injured in the Wednesday explosions have been transferred to Iran for medical treatment, according to emergency officials in Lebanon.

The Lebanese Army command has asked citizens not to gather in places witnessing security incidents to allow medical teams to arrive.

Members of the Lebanese Civil Defense are working to extinguish fires that broke out inside homes, cars and shops in the Bekaa, the South, Mount Lebanon and the southern suburbs due to the explosions, officials said.

All walkie-talkie devices were taken from security services members at the Rafiq Harir International Airport in Beirut after news of the devices exploding.

Pagers explode across Lebanon on Tuesday

At least 12 civilians were killed and at least 2,800 people injured in the explosions that took place Tuesday, according to Lebanese authorities. Around 460 of the injuries were critical and required surgery, Lebanese Health Minister Firass Abiad said. Most victims are suffering from eye and facial injuries, while others suffered injuries to hands and fingers, he said.

Israel was behind the deadly explosion of pagers across Lebanon on Tuesday, sources told ABC News on Wednesday.

There was about 1 to 2 ounces of explosives in each of the pagers that exploded Tuesday, according to a source familiar with the attacks.

The Hezbollah militant group said it is conducting a "security and scientific investigation" into the explosion of pagers across Lebanon on Tuesday.

Hezbollah said 11 of its members were killed on Tuesday, though -- as is typical in its statements -- did not specify how they died.

"We hold the Israeli enemy fully responsible for this criminal aggression, which also targeted civilians and led to the deaths of a number of martyrs and the injury of a large number with various wounds," Hezbollah said of the pager explosions in a Tuesday statement.

In a Wednesday morning statement, Hezbollah said it would continue operations to "support Gaza," and vowed a "reckoning" for Israel for the "massacre on Tuesday."

The dead and injured included people who are not members of Hezbollah. Lebanese officials said that an 8-year-old girl and an 11-year-old boy are among the dead.

At least 14 people were also injured in targeted attacks on Hezbollah members in Syria on Tuesday, according to the Syrian Ministry of Foreign Affairs.

Israel has not commented on explosions

Israel has not commented on its alleged involvement in the apparent attack, which prompted chaos in the capital Beirut and elsewhere in Hezbollah's south Lebanon heartland.

Around 100 hospitals received wounded people, the Lebanese Ministry of Public Health said, with hospitals in Beirut and its southern suburb quickly filling to capacity. Patients were then directed to other hospitals outside the region.

The Iranian ambassador to Lebanon, Mojtaba Amani, was among those who had one of the pagers and was injured in an explosion Tuesday, according to the Iranian ambassador to the United Nations.

The diplomat said in a phone call that he was "feeling well and fully conscious," according to Iranian state TV.

"I am proud and honored that my blood has become one with the blood of the honorable Lebanese people, as a result of the horrific terrorist crime that targeted our brotherly Lebanon yesterday. This noble country has stood with dignity and pride since the first day of al-Aqsa Storm," Amani said Wednesday.

The Iranian ambassador to the U.N., Amir Saeid Iravani, called the alleged Israeli attack an act of a "terrorist nature, aimed at escalating tensions in the region."

"The Islamic Republic of Iran will duly follow up on the attack against its ambassador in Lebanon, which resulted in his injury, and reserves its rights under international law to take required measures deemed necessary to respond to such a heinous crime and violation," the ambassador wrote in a letter to the U.N. secretary-general, the president of the U.N. Security Council and the president of the U.N. General Assembly on Wednesday while calling on them to condemn the attack.

Fears grow of Israel-Hezbollah escalation

The alleged Israeli operation has again piqued fears of escalation in the Israel-Hezbollah conflict ongoing since Oct. 8, when members of the Iranian-backed group began cross-border attacks in support of Hamas' war with Israel in the Gaza Strip.

Frontier skirmishes, Israeli strikes and Hezbollah rocket and artillery salvoes have been near-constant through 11 months of war in Gaza. Israeli officials have repeatedly threatened to launch a new military operation against Hezbollah along the Israel-Lebanon border. Tens of thousands of Israelis have left their homes in border regions due to the fighting.

The Israel Defense Forces said warplanes hit Hezbollah targets in six locations in southern Lebanon overnight into Wednesday. Artillery strikes were also conducted, it added.

Hezbollah leader Hassan Nasrallah is due to make a public address on Thursday afternoon to address the situation. In February, Nasrallah urged members to stop using their cellphones, describing the technology as "a deadly agent."

Schools across Lebanon were closed on Wednesday, Lebanese state media reported, citing the country's Minister of Education. Schools and offices closed included public and private schools, high schools, technical institutes, the Lebanese University and private higher education institutions, Lebanese state media reported.

The Lebanese Council of Ministers collectively condemned "this criminal Israeli aggression, which constitutes a serious violation of Lebanese sovereignty and a crime by all standards."

It added that "the government immediately began making all necessary contacts with the countries concerned and the United Nations to place it before its responsibilities regarding this continuing crime."

World reacts to pager attacks

The U.N. special coordinator for Lebanon condemned the attack on Lebanon, calling it an "extremely concerning escalation in what is an already unacceptably volatile context," in a statement released by the U.N. Office of the Spokesperson for the Secretary General.

Secretary of State Antony Blinken said during a press conference in Egypt on Wednesday that the U.S. "did not know about and was not involved" in Israel's pager attacks in Lebanon and Syria -- but said that officials were still gathering information and did not directly blame Israel.

"Broadly speaking, we've been very clear, and we remain very clear about the importance of all parties avoiding any steps that could further escalate the conflict that we're trying to resolve in Gaza," Blinken said. Its spread to other fronts, he added, is "clearly not in the interest of anyone involved."

A cease-fire deal in Gaza, Blinken added, would "materially improve the prospects of defusing the situation" on the Israeli-Lebanese border and allow thousands of people living near the area on both sides of the divide to return home.

National Security Council spokesperson John Kirby also told reporters that the U.S. was not involved in Tuesday's or Wednesday's incidents "in any way."

"We still don't want to see an escalation of any kind," he said. "We still believe that the best way to prevent escalation, to prevent another front from opening up in Lebanon, is through diplomacy."

The U.S. and the European Union have both designated the Hezbollah militant group a foreign terrorist organization.

ABC News' Luis Martinez, Shannon K. Kingston, Ghazi Balkiz, Morgan Winsor, Anne Flaherty, Nasser Atta, Joe Simonetti, Jordana Miller and Helena Skinner contributed to this report.