It's been 38 years since two young Montgomery County sisters disappeared.

On the morning of March 25, 1975, 12-year-old Sheila Lyon and 10-year-old Katherine Lyon walked from their Kensington home to the Wheaton Plaza shopping center in order to have lunch at the Orange Bowl restaurant.

Witnesses spotted the girls talking to a middle-aged man who was wearing a brown suit and carrying a briefcase outside the restaurant. The girls were spotted speaking into a microphone attached to a tape recorder that the man was carrying.

Later in the day, the sisters were seen walking toward their house, but they never returned home.

An extensive search was conducted after the disappearance of the girls, whose father was a well-known radio host. About two months after the sisters went missing, Maryland's then-governor called the National Guard to search for them in a Montgomery County forest.

After The Washington Examiner wrote about this case in April 2010, a reader contacted police with information. Police are continuing to seek tips.

If they are alive today, Sheila is 51 years old and Katherine is 49 years old. The girls both had blond hair and blue eyes when they went missing.

Anyone with information can call police at 240-773-5070. People can also call Crime Solvers at 866-411-TIPS (8477).