Investigators scrambled to piece together a motive in a fatal shooting spree at a Washington mall Friday but would not rule out terrorism after a nearly 24-hour manhunt ended with a Turkish immigrant, who seemed to be in a “zombielike” state, surrendering to police.

Rep. Michael T. McCaul, Texas Republican and chairman of the House Homeland Security Committee, said on Fox News’ “Sunday Morning Futures” that law enforcement authorities were “playing it safe, saying there are no links to terrorism.”

“But I wouldn’t be surprised if we find out more details about this individual, as well as we did Mr. Rahami,” he said, referring to New York and New Jersey bombing suspect Ahmad Khan Rahami.

Arcan Cetin, 20, an immigrant from Turkey and legal permanent U.S. resident, was arrested Saturday night on five counts of first-degree murder.