A man shot and killed three people in downtown Fresno, Calif., on Tuesday before turning himself in to the authorities, according to a Los Angeles Times report.

Police identified a 39-year-old man named Kori Ali Muhammad as the suspect. They believe him to also be behind the killing of a security guard on Thursday, Fresno Police Chief Jerry Dyer told the Times.

“This was a random act of violence,” Dyer said.

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Reports of gunfire first came in around 10:45 a.m. on the 300 block of North Van Ness Avenue in Fresno. Reports of three additional shootings soon followed.

In less than a minute, 16 shots were fired, Dyer told the newspaper.

Shortly after, a driver in a truck for PG&E, a California-based gas and electric company, reportedly pulled into the local police station to notify authorities that a passenger had been shot. The driver said the passenger had been shot by a gunman who approached the two men.

Dyer told the Times that Muhammad had shown hatred toward the government and white people, adding that he shouted “Allahu Akbar” before surrendering to the police.

Dyer said it is not yet clear whether the killings are terror-related.

“Too early to say whether or not this involves terrorism,” he said. “Certainly by the statement that was made it could give that indication, however, there was no statement that was made Thursday night when he shot the security guard. There was no comments made at that time.”

PG&E said it is still trying to piece the Fresno incident together.

“Our thoughts are with all involved in the incident that occurred in Fresno today,” PG&E told the newspaper. “Public and employee safety is always our top priority.”