It looked like an emergency but it was just drills Sunday morning at the Windsor-Detroit Tunnel.
A joint exercise between the Detroit Fire and Police Departments, the Detroit-Windsor Tunnel Authority, Homeland Security and Emergency Management, U.S. Customs and Border Protection, and Canada Border Services Agency was conducted.
A full-scale drill testing a medical response operation took place from 8 a.m to 10:30 a.m.
The tunnel remained open to traffic during the exercise.
