A dispute among local truckers, incomplete preparations and factional fighting Friday postponed the dispatch of desperately needed food to the starving in Somalia.

The deployment of the first of 3,500 U.N. troops meant to protect donated food from marauding gunmen also was delayed, for unspecified logistical reasons. The first 60 of 500 troops from Pakistan now are scheduled to arrive Tuesday, the top U.N. military official in Somalia said.Belgium Friday agreed to send 550 paratroopers for the U.N. contingent, and Canada said it would send three planes to help in the airlift.

Meanwhile, Swiss authorities said they were investigating U.N. allegations that Swiss and Italian companies were trying to profit from the breakdown of central authority in Somalia to dump toxic waste there. Italy's environmental minister said Thursday that he had ordered a police investigation into the charges.