Tameside Hospital A&E ward closed after 'CS gas' attack
A suspected CS gas attack by an arrested man forced the evacuation of a hospital emergency ward.
The man "discharged a noxious substance" in Tameside General Hospital in Ashton-under-Lyne, police said.
A number of people suffered effects similar to those associated with CS gas and the ward was closed for about an hour.
Greater Manchester Police said officers had clearly failed to properly search the man.
He had been arrested at 03:15 GMT in Dukinfield on suspicion of being in an "enclosed premises" and was taken to hospital after "deliberately" injuring his head as he was loaded into a police van.
After the gas was released, the man was further arrested on suspicion of possessing a noxious substance and other offensive weapons.
Ch Supt Rob Potts said the original arrest was being referred to the force's professional standards branch.
'No serious reaction'
"While it is too early to say exactly what happened, it is clear we have failed to sufficiently search the man prior to putting him in the van," he said.
"While some people did suffer some mild side effects, thankfully it has not caused anyone to become seriously ill.
"However, it is regrettable that this incident caused the closure of the A&E department for a short time."
A statement from Tameside Hospital NHS Trust confirmed the incident.
"Incoming patients were diverted for approximately one hour as a result," it said.
"Nobody waiting in the A&E department suffered any serious reaction to the noxious gas and the department is now fully operational again.
"This issue is now a matter for Greater Manchester Police."