The combined death toll in Turkey and Syria from the earthquake has surpassed 28,000, and hope of finding many more survivors is fading despite some miraculous rescues.
German rescuers and the Austrian army paused search operations on Saturday, citing clashes between unnamed groups.
Security is expected to worsen as food supplies dwindle, one rescuer said.
And nearly 50 people have been arrested for looting, with several guns seized, local media reported.
Turkey's president said he would use emergency powers to punish anyone breaking the law.