A police van blocks the road just outside the crime scene area in west London.
A London schoolboy was arrested on suspicion of murdering 46-year-old Dariusz Wolosz.
Wolosz was stabbed to death in west London on Tuesday.
Dariusz Wolosz, 46, was found with stab wounds midnight on Tuesday on the High Street in Yiewsley, West Drayton. He died a short time later.
The Metropolitan Police said they believe Wolosz was attacked by a group of males on Tavistock Road. The group fled in different directions, officers said.
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The 13-year-old arrested on Thursday is being questioned by police.
Detective Chief Inspector Wayne Jolley said officers are still are looking for others that may have been involved.
“Dariusz’s family are distraught and we are doing everything we can to support them at this time,” he said.
“I urge local people to check any doorbell and dash cameras to check them. You may have captured something that could be very significant for us.”
A post-mortem examination showed Wolosz died from stab wounds to the groin and chest.