DETROIT — Last week an unidentified man began firing randomly at motorists on and along the I-96 corridor between Ingham County and Wixom in Metro Detroit.

Despite a flurry of 22 such attacks within a 48-hour stretch from Oct. 16 through Oct. 18, the culprit, reported to be a man in his late-20s or 30s, has so far evaded capture by police.

Authorities hope a $12,000 reward is enough to uncover "information leading to the arrest and conviction of the individual(s) responsible for these crimes."

The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is offering a $10,000 reward and CrimeStoppers is offering $2,000.

None of the victims have been injured.

Police have released a sketch of the suspect based on a victim's description and believe the shooter is driving a dark 1998 Oldsmobile Alero or a 1998 Toyota Camry.

Forensic scientists examined bullet fragments recovered from seven of the shootings and "seven of the (bullet) fragments have been tied to one weapon," Oakland County Undersheriff McCabe said Tuesday.

Nearly 70 investigators from nine law enforcement agencies have been assigned to a task force investigating the case.

The task force encourages citizens to remain vigilant in reporting by calling the tip line at 1-800-SPEAK UP.

Reported incidents: