Israeli aircraft pounded Hamas government buildings in Gaza on Saturday, including the prime minister's office, after Israel's cabinet authorized the mobilization of up to 75,000 reservists, preparing for a possible ground invasion.

Hamas, the Islamist group that runs the Gaza Strip, said Israeli planes bombed the office building of Prime Minister Ismail Haniyeh - where he had met on Friday with the Egyptian prime minister - and struck a police headquarters.

Despite the violence, Tunisia's foreign minister arrived in the coastal enclave early Saturday in a show of Arab solidarity, heading to a hospital to visit the wounded.