Five people were killed and four others were injured on Tuesday night after a pickup truck plowed into a group of bicyclists on a road about seven miles north of Kalamazoo, Mich., the authorities said.

The crash happened around 7 p.m. near Markin Glen Park on North Westnedge Avenue in Cooper Township, Mich.

The driver fled on foot but was later arrested a short distance away, Jeffrey S. Getting, the prosecuting attorney for Kalamazoo County, said at a news conference on Tuesday. He described the driver as being a 50-year-old man from western Michigan.

Mr. Getting said a decision about what, if any, charges would be filed would be made on Thursday, after an investigation by the Michigan State Police.