British police are investigating an incident where flags affiliated with the Lebanese terrorist Hezbollah group were raised during Shiite Muslim commemorations earlier this month.

Demonstrators on Oct. 12 have reportedly raised “Hezbollah” flags at a procession marking Ashura.

Thousands of Muslims worldwide flog themselves on the Day of Ashura. The sombre festival is marked with 10 days of self-flagellation parades, in which Muslims whip and cut themselves with chains and knives.

Raising Hezbollah’s flag falls under the penalty of anti-terrorism laws according to British laws.

“By the virtue of Section 13 of the Terrorism Act 2000, whoever shows a flag or any other instrument in public place, aiming at raising doubts on his/her affiliation or support for an outlawed group, is considered to have committed a crime,” read a statement by Scotland Yard on Friday, received by Asharq Al-Awsat newspaper.

Several Muslim leaders in Britain condemned the politicization of the procession by raising slogans and chants that were not linked to the annual religious commemoration.