Baghdad, Iraq ? Iraqi guerrillas will step up attacks in the next few months in an attempt to thwart a transfer of sovereignty from the occupation authority to a new Iraqi government, the top U.S. administrator in Iraq said Friday.

But L. Paul Bremer said U.S. forces were getting better intelligence in the fight against insurgents who stage attacks daily. Hours before he spoke, a roadside bomb hit a U.S. military convoy in Baghdad, killing one soldier. Two Iraqi civilians also died, and 13 were wounded.

“In the immediate phase ahead of us, between now and the end of June, we will actually see an increase in attacks, because the people who are against us now realize that there’s huge momentum behind both the economic and political reconstruction of this country,” Bremer said.

According to a Nov. 15 agreement between the U.S.-led coalition and Iraq’s Governing Council, caucuses will be held across Iraq to elect delegates who will convene by the end of May. One month later, the delegates will elect a transitional government with full sovereign powers, formally ending the U.S.-led occupation — although American troops will stay on.