A suspect is in custody in connection with an aggravated robbery investigation in Alton, police Chief Jonathan Flores said Thursday afternoon.

Police say a call came in at about noon regarding an incident at the G&G Auto Repair shop on the 200 block of South Inspiration Boulevard.

Four people have been detained. Flores says three of them were picked up at the scene and the fourth was involved in a police chase.

Chief Flores says there is no immediate threat to the community.

A lockdown was temporarily issued to local schools, but it has since been lifted, Flores said.

Police are speaking to witnesses as the investigation continues.