A mosque in Northeast D.C. has been vandalized for the second time this week, prompting the Metropolitan Police Department to investigated whether the acts were motivated by hate.

NBC4 reports that the Ivy City Mosque located in the 2000 block of Gallaudet Street NE was “ransacked” late Monday night. The damage was reportedly minimal and the MPD determined the incident to not be a hate crime as there was another vandalism reported nearby around the same time.

However, a second act of vandalism to the mosque— in which the vandals “ripped religious hangings from the walls and broke furniture”—occurred late Wednesday night prompting authorities to investigate both incidents as a potential hate crime.

“Two alleged acts of vandalism against a house of worship in less a week is a matter of deep concern,” David Friedman, Regional Director of the Anti-Defamation League, said in a statment. “We are confident that the Metropolitan Police Department will pursue every avenue of investigation, including whether the acts were motivated by hate. Because of the special impact of bias-motivated violence and vandalism, the Department should spare no effort in bringing the perpetrators of these crimes to justice.”

Meanwhile, the Council on American-Islamic Relations is offering a $500 reward to anyone who provides information leading to an arrest.