FERGUSON, Mo. — Ferguson police Officer Darren Wilson did not receive a severance package when he resigned over the weekend, the St. Louis suburb’s mayor said Sunday.

Wilson, 28, won’t receive any further pay or benefits, and he and the city have cut their ties, Mayor James Knowles told reporters a day after Wilson tendered his resignation, which was effective immediately.

Wilson, who is white, had been on administrative leave since he killed Michael Brown, an unarmed black 18-year-old, during an Aug. 9 confrontation. A grand jury decided last week not to indict him, sparking days of sometimes violent protests in Ferguson and other cities.

Wilson wrote in his resignation letter that his “continued employment may put the residents and police officers of the City of Ferguson at risk, which is a circumstance I cannot allow.”

His lawyer, Neil Bruntrager, said Wilson decided to step aside after police Chief Tom Jackson told him about the alleged threats.

“The information we had was that there would be actions targeting the Ferguson (police) department or buildings in Ferguson related to the police department,” Bruntrager said.