stolen Diamondback

It was our landlord who saw the garage open when he passed by at around 12nn and told us about it. While we were checking our things, a neighbor approached us and said that he already noticed our garage was open when he passed by around 8am. Possibly stolen last night or early this morning. The two bikes you see in the photos were both stolen but I only have my son's bike serial number with me since this is newly bought as an advance birthday gift for him. The other bike is a GT All Terra. I hope you can help us recover our bikes.