A second wave of device explosions has killed 20 people and wounded more than 450 others in Hezbollah strongholds in Lebanon, officials said, stoking fears of an all-out war with Israel, AFP reports.

A source close to Hezbollah said walkie-talkies used by its members blew up in its Beirut stronghold, with state media reporting similar blasts in south and east Lebanon. AFPTV footage showed people running for cover when an explosion went off during a funeral for Hezbollah militants in south Beirut in the afternoon.

“The wave of enemy explosions that targeted walkie talkies… killed 20 people and wounded more than 450,” Lebanon’s health ministry said in a statement.

They came a day after the simultaneous explosion of hundreds of paging devices used by Hezbollah killed 12 people, including two children, and wounded up to 2,800 others across Lebanon, in an unprecedented attack blamed on Israel.

“The centre of gravity is moving northward,” Israeli Defence Minister Yoav Gallant said during a visit to an air base on Wednesday. “We are at the start of a new phase in the war.” Israeli officials have remained tight-lipped about the explosions.