Salat al-Khawf, or the "fear prayer", is a special prayer performed during times of imminent danger, such as during warfare. It can be performed with a minimum of three people - an imam leading one follower in prayer while another stands guard. There are varying reports on the number of rakah that can be performed, ranging from two to four rakah depending on the circumstances. The prayer can be performed individually if fighting makes congregational prayer impossible. Precautions must be taken to defend against enemy attack during the prayer, such as dividing soldiers into praying and guarding groups depending on the enemy's position.