The Ahmadis are considered heretics, and thus are fair game for this kind of persecution by mainstream Muslims. “Hundreds attack mosque,” from AFP, July 29 (thanks to Twostellas):
JAKARTA – INDONESIAN police clashed with about 200 people on Thursday as the mob tried to attack a mosque in West Java belonging to a minority Islamic sect.
The crowd hurled stones at an Ahmadiyah mosque in Manislor village in Kuningan district, leading to an hour-long conflict with police, said local general secretary of the Ahmadiyah sect, Nurahim.
‘About 200 people pelted stones at our mosque and clashed with the police for about an hour. It’s not clear yet who was the organiser of the mob,’ Mr Nurahim, who goes by one name, told AFP….
‘We had a similar experience before in 2007, in which our mosque and houses were attacked. A house was burned and several were damaged at the time,’ Mr Nurahim said.