Two National Security Guards personnel, including an officer, were on Friday were killed and six other commandos injured during operations against terrorists in Mumbai, the first casualties suffered by the elite force during the siege.

Major Sandeep Unnikrishnan, 31, was killed while engaging terrorists this morning at the Taj hotel, an NSG spokesperson told PTI.

Commando Chander received fatal bullet injuries during gun battle at Nariman House, the official added.

Six other commandos were also injured during the encounters with terrorists at Taj Hotel, Oberoi-Trident and Nariman House.

Major Unnikrishnan was with the 51 Special Action Group of the force and was with the NSG on deputation.

He has been with the Black Cat commando force for the last two years.

An officer of the Bihar Regiment, he was commissioned in the Indian Army [Images] in June 1999.

The officer had joined the NSG on deputation in January 2007 after having served two tenures with his battalion in counter insurgency and counter terrorism roles.

The officer hails from Bangalore where his father works for the Indian Space Research Organisation.