Two men carried out two violent assaults within half an hour on a busy road in Northampton on Easter Sunday.
Police are linking two assaults on different men in Spencer Bridge Road in St James.
The first incident took place at the junction of St James Park Road and Spencer Bridge Road at 7pm, when the victim walked past two men who kicked him in the head and shouted abuse at him as he ran off.
A police spokesman said a man in a small blue car – possibly a Sedan or Honda Civic - stopped to check on his welfare and officers would like this man to get in touch.
The second incident happened about 30 minutes later at the junction of Gladstone Road and Spencer Bridge Road, when another victim walked past two men with the same description.
The men grabbed and punched him and struck him to the head with a bottle, causing bruising and a cut lip.
The driver of a white van pulled up and sounded his horn, distracting the offenders and enabling the victim to get away. Officers would also like this witness to get in touch.
The offenders in both incidents are described as being Eastern European. One was tall with a full, black beard and wore grey sweatpants and a matching, long-sleeved grey top which had a red stripe on each arm. The other was smaller with a stocky build and was clean-shaven. He wore a thin, dark coloured sports jacket and dark trousers.
Witnesses, or anyone with information, are asked to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555111.