Three men are missing after a landslide that hit Colorado on Sunday, just weeks after Baltimore, Maryland faced the same natural disaster.

The Colorado landslide hit Collbran, located in the state's western region, at around 8:15 p.m. EDT Sunday night, NBC News reports. It was four miles long and two miles wide and is estimated to have reached up to 250 feet in depth. An eyewitness reported the landslide to the Mesa County Sheriff's Office and said it sounded like a freight train

"This slide is unbelievably big," sheriff's Lt. Phil Stratton said.

The Mesa County Sheriff's Office suspects that the ridge that created the landslide was most likely sliding all day. As a result, the sheriff's office has created a roadblock near the intersection and has "highly discouraged" people from entering the scene of the slide.

Meanwhile, NBC News reports that an aerial search is being conducted to find the three unnamed people lost during the landslide. According to Live 5 WCSC, crews also looked for the missing people Sunday night. Police report that those missing went to observe the landslide but never came back.

This massive slide comes less than a month after a 120-year-old retaining wall fell victim to a month-long period of heavy rain in Baltimore, Maryland and collapsed, creating a landslide on April 29. No one was injured. The Baltimore Sun reports, however, that six cars, street lights and sidewalks slid into a nearby railroad track.

"My eyes were just riveted on the road and the railing just falling away," witness Dana Moore told the newspaper. "It was there and then it wasn't."

"What I saw was actual cracks in the pavement, cracks where the pavement had dropped six inches and split open," Jeff Larry, another witness added. "... A lot of the cars were on a much more significant lean than they usually were."

Check out a video of the Baltimore landslide below:

Follow Scharon Harding on Twitter: @ScharHar.