A BLACK rucksack potentially key to a police investigation could be lurking in a Bicester resident's garden or bin. 

Officers investigating an attempted burglary have asked residents near Town Walk East and Ruskin Walk to search for the bag, which could provide crucial evidence.

Police tweeted the request this afternoon, and asked people not to taint the item by touching it if found.

Anyone who finds the bag can call police on 101, and officers advised them to cover it with bin bags. 

Two men have been arrested on suspicion of attempted burglary.

Police did not state when or where the suspected attempted burglary happened.