Authorities said Friday the members of the al-Aqsa Martyrs Brigades were detained for questioning. The group is loosely affiliated with the ruling Fatah movement.
An al-Aqsa spokesman confirmed that two of the group's militants had been detained.
Palestinian President Mahmoud Abbas recently vowed to use an "iron fist" against militants to enforce a truce between Israel and the Palestinians.
Some information for this report provided by AFP and Reuters.