A female police officer, reportedly 25, was killed after she was called to reports of a traffic accident involving a grey Clio at around 7.15am.France is slowly taking on the appearance of a country suffering a low level insurgency.
A street sweeper was critically injured in the shooting, which is now being treated as a "terrorist act" by the French authorities.
Sky's Crime Correspondent Martin Brunt said police with heavy armour were seen in Porte de Chatillon shortly afterwards and TV news crews were being pushed back from the area, which was sealed off with tape.
Meanwhile, officers are still hunting for suspects in the deadly gun attack on the offices of satirical magazine Charlie Hebdo.
[Police officer killed in second terror attack, Sky News, January 8, 2015]
Some 200 soldiers from parachute regiments across the country have been drafted in to Paris, bringing the number of military patrolling the streets to 850...
In today's attack, which is not being linked by officials to yesterday's shootings, a man wearing a bullet-proof vest fired at the council worker and police woman, who became the third officer to be killed in the capital in 24 hours.