No one was injured in the firing by Constable Keshto Ghosh, who was deployed in the peripheral security at the Chief Minister's residence at Gupkar Road. Abdullah was away on campaigning for the upcoming Assembly polls.
Ghosh, who hails from West Bengal, was immediately overpowered and taken into custody.
He told the interrogators that he was facing severe mental depression because of which he indulged in this act, official sources said.
BSF spokesman said Ghosh, a 2012 recruit, was physically fit but started behaving abnormally this morning. There were no administrative issues with the constable, he said.
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"He has been availing the leave entitlement. There is nothing on that front," the spokesman added.
"He will not be posted on duty again till the inquiry into the incident is over and he is given a clearance by the doctors," the spokesman said.