A cyclist has been stabbed to death with a large knife, believed to be a machete, near a busy shopping centre.
The attack on Mark Biggs appeared to have been motiveless
Mark Biggs, 39, from the Peabody Estate in Camberwell, south-east London, was attacked as he rode past McDonald's in nearby Denmark Hill on Monday evening.
Police said there was no obvious reason for the attack.
Witnesses described seeing blood all over the floor. Residents are being asked to check their gardens for the murder weapon.
Flowers have been laid at the scene, with one reading: "I love you with all my heart, wifie Sylvia."
'A lot of blood'
Huseyin Mentes, 23, was working in a shop near the scene and said the first he knew of the attack was when he heard a woman scream.
He said: "There was this guy on the floor. At first I thought he was having a fit because he was shaking and I didn't see the blood.
"Then someone said he had been stabbed and everyone started crowding around. There was a lot of blood on the floor."
The suspect fled down Butterfly Walk and through a nearby shopping arcade.
A police spokesman said: "There does not appear to have been an argument or altercation prior to the stabbing.
"We are looking for a large 12 to 18-inch bladed weapon, possibly a machete, that we believe may have been concerned in the attack.
"It may have been abandoned in the area and we are asking local people to check their gardens and if they come across anything that resembles the weapon to alert police immediately."
The suspect has been described as a light-skinned black man, aged about 30, slim and wearing a yellow T-shirt, dirty jeans and a grey baseball cap.