Police charged troubled sprinter Ben Johnson with assault and possession of a dangerous weapon Tuesday after the Olympian allegedly pointed a gun at a passing motorist.

Johnson faces a maximum penalty of 10 years for the weapons charge and five years for the assault.An unidentified motorist filed the complaint with Ontario Provincial Police last Thursday. The motorist said a man driving a black Porsche on a suburban Toronto highway pointed a gun at him before speeding away.

Police traced the license plate to Johnson and seized a starter's pistol from his Porsche.

Such pistols fire only blanks and are used to start track events.

Johnson will appear in Provincial Court Oct 25. Neither Johnson nor his lawyer would comment on the incident.

Johnson won the 100 meters in Seoul, South Korea, Sept. 24 in a world-record 9.79 seconds. He was stripped of the Olympic gold medal and the record when traces of the banned steroid Stanozolol were found in his urine. Johnson maintains he did not knowingly take the steroid.

The sprinter was thrown off the Canadian team and flew back to Toronto.

Since his return, Johnson has been subjected to intense scrutiny. Reporters surrounded his mother's home for days and followed him on every trip outside the house.