The hardline faction of the Hurriyat Conference had been informed about his house arrest, the sources said.
On hearing the news, a handful of Geelani's supporters indulged in stone-pelting outside the residence of the separatist leader resulting in injuries to a cameraman of a TV news agency, they said.
Several other separatist leaders, including chairman of the moderate faction of the Hurriyat Conference Mirwaiz Umar Farooq, were placed under house arrest following the death of a Kashmiri youth in Hyderabad on March two.