David Conrad, a resident of Morton Grove, Ill., was likely peeved by the noise from the Muslim Education Center. Conrad’s home is adjacent to the center’s parking lot, and during the holy month of Ramadan, men, women and children pack the mosque on a nightly basis. On Friday, Aug. 10, Conrad allegedly shot a pellet rifle at the mosque wall, while some 500 people were praying inside. The building structure sustained minor damage, but no one was hurt. Was this just the rumbling of a disgruntled neighbor? Maybe.

But given a chain of incidents at mosques across the country over the past two weeks, the Morton Grove shooting doesn’t appear to be an isolated event. In the past 10 days, there have been eight cases of vandalism and attacks on houses of worship across the nation, including the deadly shooting spree in a Sikh gurdwara in Wisconsin on Aug. 5. The other seven incidents were mosque defacements, which have sent a tremor of fear through America’s Muslim community.

While Morton Grove Police have not charged Conrad with a hate crime, the FBI is currently investigating the attack as a hate crime and CAIR has also called on the FBI to investigate the Lombard incident as such. Just 25 miles from Morton Grove, an Islamic school in Lombard was targeted with an even more chilling assault on Sunday night. An assailant flung a homemade “MacGyver bomb” at the building, while worshippers prayed inside. The soda bottle — filled with household chemicals, including acid — did not break the window, and again, the worshipers were rattled but unharmed. According to local reports, no one has yet been charged, and the FBI is investigating the matter.