The man who killed seven people in Odessa, Texas, over the weekend had been fired from his trucking job hours before the mass shooting, according to multiple reports.

The gunman, identified Sunday as Seth Aaron Ator, lead officials on a high-speed chase during which he indiscriminately fired on motorists and police officers. Ator was killed after being chased by officers.

The New York Times first reported that Ator had been fired from his trucking job in Odessa.

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He was pulled over Saturday by state troopers for failing to use a turn signal before beginning firing, according to police.

An additional 22 people were injured in the mass shooting, which was the second in Texas in August.

Ator had a criminal record, but there were no open warrants for his arrest.

Despite the reports of his firing, police say a motive is still not known for the shooting.

“There are no definitive answers as to motive or reasons at this point, but we are fairly certain that the subject did act alone,” Odessa Police Chief Michael Gerke said at a news conference.