(AP) – The leader of a Muslim mosque in west Wichita that was heavily damaged by fire says someone has been sending anti-Islam letters to the mosque in recent months.

Vandals were also turning on the outside water faucet at the Islamic Association of Mid Kansas mosque, which suffered at least $130,000 in damage after a fire early Monday.

The group’s president, Abdelkarim Jibril, says the mosque had received about eight letters starting four to six months ago, but the letters had stopped about a month ago. He says the mosque’s water bill increased about $30 after someone began turning on the outside water faucet.

The Wichita Eagle reports that the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives joined the fire investigation.