Police reopened Hwy. 21 after a farm tractor and trailer rolled over into a ditch near Kettle Point.
The Ontario Provincial Police first reported the collision on Friday around 6pm.
At least one person was hurt in the crash, but the injuries are minor.
Hwy. 21 was closed both directions between Lakeshore Rd. and Thompson Line due to debris on the roadway, however, all lanes have since reopened.
While a cashier was scanning items, the man reportedly took out a firearm and demanded that they put the items into a brown paper bag.
Police are appealing for witnesses or dashcam footage
Lambton County OPP say the investigation is continuing
Point Edward virtuoso harmonica player Mike Stevens is among 83 people appointed to the prestigious Order of Canada.
Canada Day festivities are planned for Tuesday in Petrolia, Forest, Port Franks and Grand Bend.
Shortly after 6 p.m. Sunday, Sarnia police responded to reports of a man walking into traffic on Christina Street near Wellington Street, and threatening random people on the sidewalk.
