Young children witnessed a fatal stabbing as a 39-year-old man collected his child from school in Birmingham.
Police spent the day searching for evidence
Police said the man, who is from Handsworth, was collecting his step-daughter from Holte School in Lozells.
He was attacked outside neighbouring Lozells Primary School, on Wheelers Street, as children returned from a swimming lesson on Tuesday afternoon.
Two men, aged 33 and 49, and a 16-year-old youth have been arrested and are helping police with their inquiries.
A post-mortem examination revealed the victim, who is originally from Somalia, died from stab wounds.
Police said the trio being questioned are also from the East African country and are related to the dead man.
Witnesses said the victim was attacked from behind as he spoke on the school's intercom system.
The man, who received two stab wounds, was taken to the City Hospital in Birmingham where he later died.
Police spent Wednesday searching the streets for evidence, although they said they had not found a weapon.
Detective Chief Inspector Gez Moore said it was regrettable that children saw the stabbing.
"It's a concern that they've actually witnessed this.
"The area that the victim went into is a gated area for a vehicle.
"The schoolchildren came out of a different gated area and at no time were the children at risk."
Pupils at Holte School and Lozells Primary School stayed at home on Wednesday.
Recka Cumari, who works as a teaching assistant at Lozells Primary School, said she was scared by what had happened.
"We're just all really in shock, we'd just come back from swimming and all I could think of is what if it had happened to one of the children.
"It's horrible, my legs are still shaking."
Both schools will be open as usual on Thursday.