Is the US/Israel arming Dahlan against Hamas?

From Debka File, so take it with a grain of salt because it might just be provocation:

DEBKAfile’s military sources reveal that last week, US and Israel transferred a quantity of automatic rifles to Abu Mazen’s Fatah forces
December 17, 2006, 8:14 AM (GMT+02:00)
The guns reached Fatah leader Mohammed Dahlan who handed them over to the faction’s suicide wing, al Aqsa Martyrs’ Brigades, Abbas’ only reliable strike force. Dahlan is now in command of the armed campaign against Hamas from presidential headquarters in Ramallah. Israeli officials are turning a blind eye to transfer of the arms into the hands of the most badly-wanted masterminds of Fatah suicide killings, such as Jemal Tirawi from Nablus.

Wouldn't exactly be surprising, though.