An explosion targeting police in the northern city of Talafar killed at least four people and wounded 16, Iraqi and U.S. officials said. There were conflicting accounts of what caused the blast. Military spokeswoman Capt. Angela Bowman said it was a car bomb, but police in nearby Mosul said it was a device planted in the road. Talafar General Hospital received four dead and 16 wounded in the explosion, said the facility's directory, Dr. Fawzi Mohammed al-Taan. Two Iraqi police were among the wounded, said Bowman.