Israel says it will allow security forces loyal to Palestinian President Mahmoud Abbas to be supplied with weapons from third countries.
The announcement follows clashes between Mr Abbas’s supporters and rivals from the Hamas militant group.
But Mr Abbas’s office denied the story. A BBC correspondent said he might not want to be seen accepting Israeli help.
Earlier, Mr Abbas challenged Hamas to accept a joint political programme with his Fatah faction or face a referendum.
The plan, drawn up by jailed Palestinian leaders from all the main factions, says attacks on Israel should be limited to the land occupied by it since 1967 – implying recognition of Israel within its pre-1967 borders.