A gunman opened fire on two plain-clothes police officers in a south London street this morning.

The officers were shot at after confronting two men “acting suspiciously” in Sandmere Road, Clapham, at about 4.20am on Sunday.

Police said a man aimed a gun in their direction.

A single shot was fired but fortunately the bullet missed and neither policeman was injured.

A police helicopter was scrambled and armed officers descended on the area this morning.

One local tweeted: “There's police blocking my road and a helicopter circling above. What's happening?

“The police have got guns, massive ones, and are hovering outside of their cars.”

No weapons were found after police scoured the area.

Chief Inspector Roy Smith, who is based in Brixton, also tweeted about the incident.

“I have just seen the two officers who were shot at during the early hours of this morning,” he said.

“Pleased to report both officers are uninjured.”

A man has been arrested in connection with the incident.

A Scotland Yard spokeswoman said enquiries were ongoing.