BERLIN (AP) — German police say one or more assailants threw rocks through the apartment windows of Saxony's justice minister, and then threw stink bombs into the home.

Police told the dpa news agency that minister Sebastian Gemkow, his wife and two children were in their Leipzig home during the attack early Tuesday but nobody was hurt.

Saxony has been the center of the PEGIDA anti-Islam marches and a lot of recent anti-immigrant violence, but police said it was not yet known who was behind the attack or what their motivation was. A special investigative unit focused on extremist crime is leading the investigation, however.

Authorities have responded to 940 crimes nationwide related to the PEGIDA demonstrations since they began in October 2014, including 255 "right-wing political crimes," Berlin's Tagesspiegel newspaper reported.