The police were given more time to question a suspect who was accused of murdering a mother during a school run.
Aliny Mendes, 39, was stabbed to death on Friday when she picked up her children from school.
Residents of busy A Street in Ewell, Surrey said they were carrying a child at the time of the "shocking incident".
A man in his forties was arrested on suspicion of the murder of the Brazilian.
But now the Surrey Police has more time to question the suspect from near Epsom.
"We work incredibly hard to pull things together during this shocking incident and do everything we can to support Aliny's family.
"I want to assure the public that we are not looking for anyone else in the incident, but there are PCSOs and officers who continue to patrol Ewell and provide security to the local population," said Detective Mark Chapman's Inspector.
Aliny, described as a "warm and wonderful" mom-to-four, was declared dead at the scene a few minutes after the terrible knife attack.
Parsons of St. George's Church in Epsom have now set up a crowdfunding site to raise money for their families and their children.
One said, "She was really lovely, everything in the church she was always involved in.
"We had dinner to raise money, and she helped organize that, she raised money for people, and I never said a bad word about her."
A priest in the church, Father Gianom, said, "She was a person full of life, she had to take great care of the children.
A second man was arrested on Friday in connection with the investigation, but was released and said he would not take further action.
Det Chief Inspector Chapman added, "We continue to ask for witnesses to contact us, and everything you've seen could really support our investigation."
The investigation continues.