Soldiers deploy in a street during clashes with gunmen in a neighbourhood area in Beirut.

Lebanese security forces stormed a building in the capital Beirut on Thursday following a shootout overnight with a man who was holed up inside a flat, an AFP correspondent at the site said.

A security official said the gunman was killed and the body of another man was found inside the flat located on the sixth floor of a building in west Beirut's Karakass district.

The army and police rushed to the site late on Wednesday after reports of gunfire.

The man subsequently lobbed grenades and began shooting at the security forces from his flat. At least six people were wounded.

The cause of the incident was unclear.

The shootout came amid heightened tension in Lebanon, where deadly sectarian violence has taken place in the last two weeks linked to the unrest in neighbouring Syria. - Sapa-AFP