Six Palestinians, including a child, have been killed in an Israeli air strike outside a militant training camp near Rafah in the southern Gaza Strip.
The attack follows three overnight Israeli strikes on Gaza Strip targets
The dead included a senior commander in the Popular Resistance Committees group and his young son.
Witnesses said three rockets were fired. At least 12 people were injured.
The attack was the deadliest such strike since the Hamas-led Palestinian cabinet was sworn in last week.
The aircraft hit a car as it was leaving the camp, where weapons training had been taking place.
An Israeli Army spokesman confirmed a vehicle had been attacked as it left the base, near the border with Egypt.
Palestinian security forces said at least two of those killed had been in the car.
Medics had earlier said the dead included a young girl, but the body was later identified as a boy.
The strike came as Palestinian President Mahmoud Abbas met PM Ismail Haniya in Gaza to discuss a row over security.
Mr Haniya has criticised a decision by Mr Abbas to assume control of Gaza's border crossings, calling the move an attempt to undermine the government's control over security matters.
Mr Abbas, whose Fatah party is a political rival of Hamas, also named an ally as head of internal security.
But Mr Haniya said on Thursday he rejected any attempts to take power away from Hamas.
Both the US and the EU said on Friday they were suspending direct aid payments to the Palestinian government.
They want Hamas to recognise Israel, renounce violence and accept past peace agreements.
Friday's Israeli air strike is the latest of several recent strikes in Gaza.
Overnight on Thursday, Israeli helicopters attacked several targets in the Gaza Strip, including offices of the armed wing of the Fatah movement.
There were no reports of casualties after the three overnight air raids.
They followed rocket attacks on Israeli towns, which Israel blamed on the Al-Aqsa Martyrs' Brigades, the armed offshoot of Fatah.