A man arrested at the scene of a collision in Tillsonburg suffered a serious injury while in police custody, the OPP say.

The crash occurred around 3 a.m. Saturday at Broadway Street and Lisgar Avenue.

According to Oxford County OPP, a van had hit a hydro pole near the intersection.

A 24-year-old man was placed under arrest and taken into custody.

Because of the injury, Ontario’s Special Investigations Unit was contacted and began an investigation into the arrest.