Really looking for some advice here on what to do about this awful situation and if it's unreasonable to escalate this incident.
My son is 6 years old and is autistic, he has significant needs, is non verbal, has no danger awareness, is a climber, runner, and needs supervision around the clock. He attends a specialist school setting and on Tuesday I got the most horrific phonecall, when I answered I asked if everything was okay as I always do as I have high anxiety around my son injuring himself/becoming poorly at school, and when the reply I got was "no, no it's not okay, I need you to remain calm" I couldn't even listen to what was wrong my heart sank and I passed the phone to my partner to hear as i was in a state of panic and froze, they told him our 6 year old had managed to escape the school playground which has a very high fencing area all the way around it by climbing up a tree, he was out of the school grounds and off into the streets. He has zero awareness of danger and just bolts off, and cannot communicate at all, so my head was in such a mess waiting for them to get back to me as they said to try and remain calm and wait and that they had contacted the police and are all out looking for him. I was thinking the worst if he were to get to a main road he would be straight out in front of the traffic as he needs to be restrained at all times with an adult. Luckily a member of the public saw him and they called me back and told me he was safe.
I just don't know what to do about this situation, he is in a specialist school with high security, he is meant to have a 1 to 1 outside at all times as stated in his EHCP plan. I just cannot understand how this has happened, how in a small playground with a small number of children he has managed to climb a tree and over a very high fence and end up outside of the school grounds. I am just so thankful he is alive more than anything, but my trust in the school has been sullied. When the head spoke to me after the incident she said he had a camouflage kind of coat on so he would have been hard to notice, but he is meant to be being watched at all times. I'm so upset, angry, anxious, there are no other alternative schools he can attend, I fought so hard to get him into this one.
I have a meeting on Tuesday with the school as I have asked to see the incident report, the CCTV footage of this incident to get some clarity. They have arranged a tree surgeon to cut the tree down that he managed to climb and said he will be wearing a high vis at all times outside and will be being watched 1 to 1 which he should be anyway.
So I guess what I'm asking here is aibu to want more than this, I am absolutely heartbroken, anything could have happened to my amazing little boy. I'm just a nervous wreck right now. The ironic thing is I called his teacher around half an hour before this incident as I've been struggling at home with his escaping the doors so have had to put bolts across every door and wanted to see if there was any more support I could get at home. I'm just beside myself right now and could really use some advice.