For updated story: see
Helicopters were flying over West Caldwell Wednesday night after an unknown incident in the township involving police from West Caldwell and Roseland that started at Walgreens.
Police cordoned off the drugstore parking lot at 601 Passaic Ave. following the incident.
When contacted about the incident, West Caldwell Police Chief Michael Bramhall referred all questions to officials from the Essex County Sheriff's Office.
Kevin Lynch, spokesman for the Essex County Sheriff's Office, was not available for comment.
Initial reports said one person was arrested, but officials believe one more person may possibly remain at large.
By 10:15 p.m. Wednesday, police were leaving the area.
Correction: The article originally stated the incident ended in the Walgreens parking lot.