A man has died and another is being treated in hospital after a double stabbing in east London, police have said.

Detectives launched a murder investigation after the death of the 29-year-old in Hackney and have so far made one arrest.

Though not named by police, the victim was remembered as a “decent young man” by a local youth worker and former schoolmate, who gave her name as Hannah: “It’s got to the point that the kids don’t value lives anymore. It’s just sad that this couldn’t have been prevented.”

She said that antisocial behaviour was common in the area, adding there were not enough people showing interest in the lives of local young people. “These are our kids that are dying,” she said.

Police were called to reports of a stabbing on Frampton Park Road shortly before 3pm and found the 29-year-old, who died after being taken to hospital. Officers were then told about a second, similar incident less than half a mile away on Wilton Way and found a second man, also believed to be in his 20s.

The Met said the dead man’s next of kin had been informed and that the other man was in a stable condition.

Dean Saliba, 40, said he witnessed the aftermath of the first stabbing when he arrived at a shop on the street. “I turned up after. Someone in the shop said he was stabbed in the back as he ran to escape,” said Saliba, who is from nearby Bethnal Green. “He was having a seizure when I arrived and there was a lot of blood.”

Scotland Yard said one man was arrested at the scene on suspicion of grievous bodily harm and was in custody. Police tape shut off a section of Frampton Park Road on Friday evening and, within the cordon, a police tent had been erected.

A London ambulance service spokeswoman said its air ambulance was dispatched to deal with the first incident, adding: “We treated a person at the scene and took them to hospital as a priority.”

She said a second call was received relating to the Wilton Way incident just four minutes later. “We sent a medic in a car, an incident response officer and an ambulance crew to the scene. We treated a man at the scene and took him to hospital.”