Two warring yakuza groups will face stronger crackdowns after public safety commissions in six prefectures designated them Tuesday as “crime syndicates at war” in an effort to weaken them and stop their escalating battles.

The Kobe Yamaguchi-gumi split from the Yamaguchi-gumi, currently the country’s largest yakuza organization, in August 2015. The designation, effective Tuesday, bans gatherings by five or more members of the gangs in areas where their offices and senior members’ houses are located.

The areas where such gatherings are banned include the cities of Gifu, Nagoya, Kuwana, Kyoto, Osaka and Kobe.

The designation by the safety commissions in Hyogo, Aichi and four other prefectures based on the anti-crime syndicate law also prohibits members of the two groups from using offices and stalking rival gangs. Violators can be arrested by police.

The measure needs to be renewed every three months and will be lifted only after the turf war is over.

Following the breakup, the feud between the two crime syndicates has escalated since last April.