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.
An Austrian army spokesperson said early on Saturday that clashes between unidentified groups in the Hatay province had left dozens of personnel from the Austrian Forces Disaster Relief Unit seeking shelter in a base camp with other international organisations.
"There is increasing aggression between factions in Turkey," Lieutenant Colonel Pierre Kugelweis said in a statement. "The chances of saving a life bears no reasonable relation to the safety risk."
Hours after Austria paused its rescue efforts, the country's ministry of defence said that the Turkish army had stepped in to offer protection, allowing the rescue operations to resume.
The German branch of the search and rescue group ISAR and Germany's Federal Agency for Technical Relief (TSW) also suspended operations, citing security concerns.