Russian investigators opened a murder investigation Thursday after a serviceman was killed in a vehicle explosion in St. Petersburg’s Pushkinsky district, according to Interfax, which quoted the regional Investigative Committee.

Local outlet Fontanka, citing a source, reported that the victim was a colonel. The explosion occurred in the Shushary area as the vehicle left a residential courtyard.

The official statement cited by Interfax did not identify the serviceman or say who was responsible. This is a developing story.