A senior commando of Andhra Pradesh greyhounds, who was injured in an exchange of fire with Maoists on the AP-Odisha border early today, succumbed to injuries here. Visakhapatnam (Rural) Superintendent of Police, Rahul Dev Sharma told PTI that the commando succumbed at a hospital here. The deceased Abubacker, along with another senior commando, was injured in the exchange of fire with ultras in Malkangiri district of Odisha early morning. Both the injured were brought in a helicopter from the encounter site and admitted to the King George Hospital here for treatment. Abubacker, who hails from Gajuwaka near here, died while undergoing treatment. Greyhounds is AP's elite anti-Maoist force. Earlier in day, 21 Naxals lost their life in firing with troopers in a major operation launched by security forces on Andhra Pradesh-Odisha border.