A rash of recent car burglaries near popular Lake Mead hiking trails is prompting National Park Service officials to warn visitors about securing their valuables.

Park rangers currently are investigating a dozen incidents in the past 30 days.

“Criminals are breaking windows and removing valuables left in plain sight, as well as glove boxes and consoles,” said Adam Kelsey, deputy chief ranger.

In the past 30 days, six break-ins were reported at the Gold Strike Canyon Trailhead parking lot, which is located two miles west of the Hoover Dam off Highway 93 in Boulder City.

Incidents also were reported at other locations: two at the White Rock Canyon Trailhead parking lot, two at the Historic Railroad Tunnel Trail parking lot, one at the Alan Bible Visitor Center parking lot and one at Kingman Wash.

Sobering news from the Boulder City Police Department: all of the businesses it targeted in an underage alcohol buying sting passed the test.

Officers sent underage volunteers into a handful of businesses with the intent of buying alcohol. If the clerk or alcohol server requests a form of ID, the person presents their real Nevada identification card/license, indicating their true age.

Clerks or servers that sell alcohol to an individual under the age of 21 receive a citation for Furnishing Alcohol to a Minor, which results in a bail of $637. No one sold alcohol to the underage people.

The stores tested were:

FBI agents are still cataloging the hundreds of pieces of artwork found inside a Boulder City storage facility, which was rented by a German man accused in an international fraud scheme.

Law enforcement arrested 51-year-old Ulrich Engler last week after a check of his fingerprints, following a driving under the influence arrest in February 2011, tied Engler to a $100 million financial scheme in Europe.

Federal agents have found jewelry, sports memorabilia, paintings and statues in the storage unit, with an estimated worth of $20 million.

Engler is being held in Las Vegas until he is deported back to Germany.