A man is in a serious condition in hospital after being stabbed in two separate attacks on the same day.
He was stabbed in the arm in a caravan in Oaks Caravan Park, Bucklesham, Suffolk at about 04:00 BST on Saturday.
The 30-year-old was taken to hospital but later left. Police were then called after he was stabbed in the back and bottom 11 miles from the caravan park.
Three people were arrested on suspicion of attempted murder and another held on suspicion of grievous bodily harm.
'No wider threat'
The victim was in a stable but serious condition after being attacked in Grebe Close, Ipswich at 12:25, police said.
Police said they have stepped up patrols in the areas, but the people involved were known to each other and there was no wider threat to the community.
A 40-year-old man and two women, aged 38 and 31, arrested on suspicion of attempted murder have been released under investigation.
A 46-year-old man held on suspicion of grievous bodily harm is still being questioned.