A powerful airstrike killed at least four people in central Beirut early on Saturday, the health ministry said, shaking the Lebanese capital as Israel pressed its offensive against the Iran-backed Hezbollah group.

The attack destroyed an eight-storey building and caused a large number of fatalities and injuries, Lebanon's National News Agency said. Footage broadcast by Lebanon's Al Jadeed station showed at least one destroyed building and several others badly damaged around it, Reuters reported..

Israel used bunker buster bombs in the strike, leaving a deep crater, the agency said. Beirut smelled strongly of explosives hours after the attack.

The blasts shook the capital at around 4 a.m. (0200 GMT), Reuters witnesses said. Security sources said at least four bombs were dropped in the attack.

It marked the fourth Israeli airstrike this week targeting a central area of Beirut, in contrast to the bulk of Israel's attacks that have targeted the Hezbollah-controlled southern suburbs. On Sunday an Israeli airstrike killed a Hezbollah media official in the Ras al-Nabaa district of central Beirut.