Banu Bakr
The truce of Hudaybiyyah was enforced for two years. The tribe of Banu Khuza'a had good relations with Muhammad, whereas their enemies, the Banu Bakr, had allied with the Meccans. A clan of the Bakr made a night raid against the Khuza'a, killing a few of them. The Meccans helped the Banu Bakr with weapons and, according to some sources, a few Meccans also took part in the fighting. After this event, Muhammad sent a message to Mecca with three conditions, asking them to accept one of them. These were: either the Meccans would pay blood money for the slain among the Khuza'ah tribe, they disavow themselves of the Banu Bakr, or they should declare the truce of Hudaybiyyah null.