Sophisticated alarm systems and security cameras are apparently not enough to keep these guys away from their prey: a total of $7 million in cash, rare books and jewelry.

The rich and famous are not safe from burglaries either. Not only do they get burgled, but the bad guys don’t get caught. A recent wave of burglaries in select districts of Los Angeles has left police a bit baffled.

A small team of burglars has managed to collect a nice $7 million’s worth of cash, jewelry and rare books over the past year, without leaving any conclusive traces.

LA police has called them “professionals.” They have left no significant clues for investigators to follow: neither fingerprints nor DNA traces nor alarms triggered. Security cameras from the victims’ homes only show blurry images.

The culprits have also been careful not to sell the booty on the black market, as police say the items have not surfaced anywhere so far.

Lieutenant Ray Lombardo, a Los Angeles detective, told the Los Angeles Times that the men, two or three of them, wearing black clothing and ski masks, seem to know what they’re doing.

“It is a target-rich environment in the hills, and these guys know it and know the homes and area. I hate to call them it, but they are professionals. They aren't opportunists. They take cash and jewelry and leave behind guns and valuable watches. They know what they are seeking.”

Police has refused to offer details. It is known that the burglars have focused on districts such as Beverly Hills, Encino and Bel-Air.

Among the victims, though not officially named, are Duran Duran guitarist John Taylor and his wife, Gela Nash-Taylor, president of Juicy Couture, as well as country music stars Tim McGraw and Faith Hill.

Basketball player Cuttino Mobley has had the misfortune of being burgled too, along with former head of Paramount Pictures, Sherry Lansing, and her husband, Oscar-winning director William Friedkin.

Photos issued by LA police show two muscular men without masks, whose ages are estimated to be between 25 and 30.