U.S. and Iraqi forces clashed with insurgents on a main Baghdad thoroughfare on Wednesday, the Interior Ministry said. At least one explosion could be heard across the Iraqi capital. There was no immediate word on casualties. The fighting broke out on Haifa street, an insurgent enclave that has been the scene of fierce fighting recently, said ministry spokesman Col. Adnan Abdul-Rahman. Also Wednesday, a roadside bomb went off in a north Baghdad neighborhood, killing one person in a passing vehicle and wounding a bystander, Abdul-Rahman said.