WASHINGTON - Two American Muslims were arrested after allegedly buying machine guns to shoot up a military recruit processing centre in Seattle, according to federal prosecutors. Abu Khalid Abdul-Latif, also known as Joseph Anthony Davis and Walli Mujahidh, also known as Frederick Domingue, of Los Angeles, were arrested Wednesday night after they arrived at a warehouse to pick up machine guns to use in the attack, an FBI agent wrote in a criminal complaint. Seattle US Attorney Jenny Durkan said in a written statement that the pair had allegedly discussed attacking the Military Entrance Processing Station in Seattle with guns and hand grenades. The facilities are used for the initial processing of recruits from all branches of the military. The alleged plot was uncovered because a tip from a member of the public who told police the pair had inquired about obtaining the guns from the individual. The tipster, who was not identified, agreed to work with the joint police-FBI task force. Abdul-Latif and Mujahidh, who have converted to Islam, were arraigned Thursday on federal weapons and conspiracy to commit murder charges, according to media reports. The men could face life in prison if convicted.