A 16-year-old boy who was killed by a car while under arrest for aggressive behaviour lay down on the road after being threatened with a Taser, police have said.

Police intercepted the boy on Albion Street at Brasall, Ipswich, after receiving reports of a man allegedly carrying a machete about 11pm on Saturday.

Deputy Police Commissioner Ian Stewart said police confronted the youth, who was unarmed at the time, and after they presented a Taser, he lay down on the road.