Police arrested three people after an alleged attack on a man in Northampton town centre.
CCTV control room staff called police to George Row at 3.47am on Tuesday after they saw three men allegedly assaulting a man, who had been knocked to the floor.
Officers arrived and arrested three men on suspicion of assault and took another man to Northampton General Hospital.
George Row was closed between 3.47am and 6.30am while police conducted forensic tests.
The alleged victim has since been transferred from NGH to a hospital in Coventry.