Police in Launceston are investigating another drive-by shooting involving targeting a house.

A man was inside the house in Tonga Street, Ravenswood when a shot was fired about midnight, but he was not injured.

Police believe the attack was drug-related, but they can not say whether it is connected to a recent series of gun crimes in the city.

Anyone who saw a vehicle in the street, or people acting suspiciously at the time of the incident, is asked to contact police.

At weekend, shots were fired into a house in Mowbray and a man was injured by a stray bullet in a city street earlier this month.

After the incidents, and the theft of 15 firearms in the state's south, police revealed they were investigating the state's firearms database and licensing process.

But they believe it is a coincidence that some thefts have occurred around the same time information was entered into its new database, introduced in June.