DETROIT (WWJ) – An alleged stalker has been arrested inside Madonna’s $10 million London mansion.

Twenty-nine year-old Grzegorz Matlok was wrestled to the ground by security personnel after he allegedly smashed a window to get in to Madonna’s mansion over the weekend. Matlok was able to get his hands on some of her possessions before he was apprehended.

At the time of the break-in, Madonna was in Bay City following the death of her grandmother.

Security workers at the mansion say they have had prior run-ins with Matlok.