One-car crash in Silver Spring kills three 3 dead in one-vehicle crash in Silver Spring Three people died and several were injured early Sunday in a single-vehicle crash in Silver Spring. Montgomery County police said eight people were in a vehicle that struck a tree about 3:20 a.m. on East-West Highway near Rosemary Hills Drive. Authorities said three passengers died at the scene. Five other occupants were taken to hospitals, one with serious injuries. . Police said those killed were a 21-year-old man, a 24-year-old woman and a female whose age wasn't available. Their names were withheld pending notification of family. Officials said they are investigating whether speed or alcohol were involved. Timothy Richardson and Luz Lazo Bicyclist is killed in hit-run incident A bicyclist was killed early Sunday in Lanham when he was struck in a hit-and-run incident, Prince George's County police said. Police said the incident occurred about 1:55 a.m. in the westbound lanes of Martin Luther King Jr. Highway, near Forbes Boulevard. Police ask anyone with information to call the Collision Analysis and Reconstruction Unit at 301-731-4422. Anonymous calls can be made to Crime Solvers at 866-411-TIPS (8477), text "PGPD plus your message" to CRIMES (274637). Police say the car involved is described as a black sedan that presumably would have front-end damage, a broken headlamp and a piece of its bumper missing. Luz Lazo 19 arrested in prostitution sting An undercover operation targeting prostitutes and their customers resulted in 19 arrests between Saturday afternoon and Sunday morning, D.C. police said. The arrests were made in the 3rd Police District near L Street NW, Massachusetts Avenue NW and New York Avenue in the vicinity of Logan and Thomas circles and Mount Vernon Square. Police said a similar operation last weekend in the same general area was carried out in response to neighborhood complaints. The 19 people arrested were charged with solicitation of prostitution, police said. NORAD exercises planned this week The North American Aerospace Defense Command, also known as NORAD, will practice interception and identification procedures over parts of the region between midnight and 2 a.m. Tuesday, using a helicopter and jet fighters. Bad weather would postpone the exercise by a day.