An Israeli military spokeswoman confirmed that an air strike on Monday took place near Jabalya refugee camp, saying it targeted resistance fighters. 
A Palestinian security source identified the dead as Rami Hannoun and Hassan Asfour, local commanders of al-Aqsa Martyrs Brigades, an armed wing of President Mahmoud Abbas' Fatah faction.
Israel has sharply escalated military action in the past two days, killing five Gaza fighters in two similar air strikes over the weekend. 

The latest killing has brought to 4946 the overall toll since the September 2000 launch of the Intifada, the majority of them Palestinian, according to an AFP tally.