Hamas on Tuesday launched a month-long campaign urging alleged Palestinian-Arab "collaborators" with Israel to turn themselves over in return for leniency.

"We announce the opening of the door to repentance for remaining collaborators and for all those who have fallen into the traps set by the enemy's intelligence services," interior ministry spokesman Islam Shahwan told reporters, according to AFP.

"We urge them to return to the bosom of their people and their families," he said, noting that the offer of clemency was open until April 11.

Under Palestinian rule, collaboration with Israel is punishable by death.

All execution orders must be approved by the Palestinian president before they can be carried out, but Hamas no longer recognises the legitimacy of incumbent Mahmud Abbas, whose four-year term ended in 2009.