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A pupil escaped after squeezing under a locked school gate but the head teacher says security is in place to prevent it happening again.
The boy got out following the incident at Chilton Primary School in Ramsgate this morning.
Head of the school Kate Law issued a statement to parents reassuring them security has been tightened to stop another pupil getting out.
Mrs Law said the youngster, who has additional educational needs, was "returned safely extremely quickly" with security at the school "constantly supervised and under review".
She added: "He was under adult supervision and squeezed under a locked pedestrian gate. Measures are in place on the gate already to prevent a recurrence.
"Staff responded immediately as he left the school site and he was returned safely extremely quickly.
"We are working very closely and continuously with this child’s family and we have their full support."
Mrs Law says children are regularly taught about protecting themselves from dangers.
The child's grandmother, Naomi Chamberlain, has given the school her support thanking staff for providing extra care for her grandson.
Commenting on the school's post on Facebook, she said: "I just wanted to add my support towards all of the staff, from teachers and volunteers to the maintenance staff for their outstanding support towards my grandson and my daughter.
"All the staff at Chilton School have done everything feasible to create a safe and secure environment for my grandson including extra fencing and security on the gates.
"I have nothing but admiration for the staff, their dedication towards helping us has been incredible."
The child's parent, who has not been named by the school, says she is confident in the school and that it is a safe place for her son and the other pupils.
"They have put so many measures in place already for my child who doesn't understand dangers and I am happy that my child is safe at school," she said in a statement released by the school.
A young child was also found wandering the streets alone in Garlinge earlier this week and was taken in by police who reunited him with his mother.