UPDATE:July 24, 2:40 p.m.Rescue crews Tuesday continued their search for a missing 20-year-old Boulder man who may be armed and suicidal in Lefthand Canyon, according to officials.

The man was first reported missing Sunday, according to Cmdr. Rick Brough with the Boulder County Sheriff’s Office. Deputies located his car at a Lefthand Canyon parking area at about 9:50 a.m. Monday.

————July 23, 11 a.m.Officials have closed Lefthand Canyon Drive at Lee Hill Road near Boulder while they investigate reports of an armed, suicidal person, according to dispatchers.

Police radio traffic indicated that sometime after 10:30 a.m. Monday, investigators found some sort of note in a vehicle that indicated a person was suicidal and armed, possibly with a rifle.

Canine and tactical units were called to the scene, according to police radio traffic. A negotiator is on standby.

Scanner traffic indicated a witness saw someone matching the suspect’s description running naked through Buckingham Park.

Check with the Daily Camera for updates

U.S. Army World Class Athlete Program Greco-Roman wrestler SFC Dremiel Byers, right, squares off against two-time Olympic medalist Rulon Gardner during Team USA’s final day of training camp at the U.S. Olympic Training Center in Colorado Springs, Colo. Byers will compete Aug. 6 for Team USA in the men’s 12-kilogram/264.5-pound division at the 2012 Olympic Games in London. Gardner won Olympic gold at the 2000 Sydney Games and bronze at the 2004 Athens Games. Photo by U.S. Army photo by Tim Hipps, IMCOM Public Affairs

A member of the Lefthand Fire Department directs a driver to turn around as Lefthand Canyon is closed due to reports of a person with a gun near Buckingham Park on July 23, 2012. Photo by Daily Camera