A Japanese Twitter user has had his account flagged and frozen after he contravened the service's rules by making a death threat - against a mosquito.

The Twitter user, who goes by the name DaydreamMatcha, only signed up to the service earlier this month but soon ran into trouble after an angry anti-mosquito outburst while watching television, according to the Sora News 24 website.

"Bastard! Do you enjoy biting me all over while I'm trying to relax and watch TV? Die? (Actually, you're already dead)", the tweet declared. The message was accompanied by a picture of the offending insect, dead on the floor.

A short time after his post, DaydreamMatcha received a message from Twitter thanking him for using the service, but informing him that his account "has been frozen because it was used to send messages containing threats.