Kollywood actor Arya has signed a malayalam film that will be directed by ace mollywood director Roshan Andrews. Roshan has delivered numerous hits in malayalam. The new project will have Arya and mollywood sensation Prithviraj in lead roles. The flick will be titled 'Mumbai Police'. The shooting is expected to go on floors in the beginning of 2011. Roshan Andrews shall start off on completion of his ongoing project 'Casanova' with Mohanlal in the lead.