MILAN, Oct 6 (Reuters) - ⁠Italian police have imposed supervision orders on 22 ⁠hardcore soccer fans as part of an ‌investigation into clashes before the Torino-Juventus derby match in May.

The 22 are members of "ultra" groups from Juve and Torino who clashed ​outside the Olimpico Grande Torino stadium ⁠in Turin on May ⁠24, the final day oflast season. They are accused ⁠of ‌throwing bottles, stones and explosive devices as well as affray, police said in a ⁠statement on Tuesday.

Nine police officers were injured ​as they ‌tried to keep the rival groups apart. A ⁠36-year-old Juventus ​fan suffered a serious head injury after he was hit by a tear gas canister during the unrest.

The ⁠precautionary measures, imposed in coordination with ​police across a number of cities in northern Italy, impose a ban on staying in Turin and an ⁠obligation to report regularly to the local authorities.

A further 20 fans accused of involvement in the clashes have also been given stadium bans.

May's match ended ​in a 2-2 draw. Juventus and ⁠Turin are scheduled to meet again in Serie Aat ​the Allianz Stadium, the home ‌of Juventus, on January 6, ​a national holiday in Italy.

(Reporting by Keith Weir, editing by Alvise Armellini and Ed Osmond)