Suspect , 28 , arrested on assault with a deadly weapon charge , FBI says . He allegedly made comments about Islam , FBI says . No motive for the shooting has been established , authorities say . David Mariner , executive director of that center , released a statement Wednesday night saying he was `` shocked to hear that someone who has volunteered with the DC Center could be the cause of such a tragic act of violence . The Family Research Council promotes conservative social policies .
Suspect , 28 , arrested on assault with a deadly weapon charge , FBI says . He allegedly made comments about Islam , FBI says . No motive for the shooting has been established , authorities say . The Family Research Council promotes conservative social policies .