Fears are growing for a missing 11-year-old boy who has not been since he disappeared last night.
John Connors was last seen in Middlesbrough, North Yorkshire, on Friday night.
He was wearing black Nike tracksuit bottoms, a jumper and black and orange Nike trainers.
Police issued an urgent appeal to trace the boy last night and urged the public to get in touch with information.
It comes as police increased patrols in South East London today after children were followed or approached by men in four separate incidents in one week.
John Connors (pictured) was last seen in Middlesbrough, North Yorkshire, on Friday night
Scotland Yard detectives accepted parents have 'real concern and anxiety' about the spate of incidents which began when two boys were approached separately by a man in Bromley on April 30 between 4pm and 4.30pm.
An 11-year-old boy - who is the son of Line of Duty actress Sherise Blackman - was asked by a man in a black van on a road if he wanted a lift.
An eight-year-old was approached in the nearby wooded area of Kelsey Park.
The Metropolitan Police received another report on Thursday of a male school pupil being followed by a man along a street on the previous day.
A 'lack of similarities' indicated it was not linked with the first two reports.
The latest incident yesterday - which is again not thought to be linked to any of the other three reports - involved a third party report of the 'perceived' attempted abduction of a young girl at The Glades shopping centre.
Line of Duty actress Sherise Blackman, pictured next to Gregory Piper who played Ryan Pilkington in the BBC police drama. Her 11-year-old son was asked by a man in a black van on a road if he wanted a lift on April 30 in the Bromley area
Two men were said to have been walking behind the child when one seemed to try to grab the girl's hand - which was raised in the air - before walking off. No children were abducted or harmed in any of the four incidents.
Now, police have written to local parents via schools, asking them to 'remind your children of the personal safety advice they have been given and report anything suspicious immediately to a parent, guardian or school staff'.
They added: 'I understand the real concern and anxiety that the nature of these incidents must bring to you and your family; please be assured that we are working closely your schools to provide additional support and advice.'