Officers have made two arrests in their search for Oliver Mazirel, who is wanted for escaping from HMP Ford, near Arundel, on Tuesday evening, 30 June.
The 38-year-old was serving a sentence for conspiracy to supply Class A drugs when he climbed the prison fence.
Detective Inspector Gary Jacobs said: "As part of our investigation we have arrested two men from Worthing, aged 35 and 38, on suspicion of assisting Mazirel after he escaped from prison.
"We are looking for a third person who we also believe assisted him.
"We intend to return Mazirel to prison and I want to make it very clear as to the consequences of assisting someone who remains at large. It is a serious offence that carries a prison sentence of up to ten years."
Mazirel is 5’7”, with short light brown hair and CCTV shows him just before he escaped from lawful custody.
DI Jacobs added: "I am urging the public to come forward with information, however small, that could help us in our search for Mazirel.
"Mazirel has links to Worthing and Littlehampton.
"Anyone who sees him or knows of his whereabouts is urged to dial 999 immediately, quoting Operation Patch."
You can also contact the independent charity Crimestoppers anonymously on 0800 555 111 or report it online. www.crimestoppers-uk.org
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