HOUSTON -- Two bicyclists were killed after a hit-and-run accident, authorities said.

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The accident happened shortly before 9:45 p.m. Thursday near the intersection of Chimney Rock Road and Kingsbrook Road in southwest Houston.

Police told News2Houston that the two men were riding mountain bikes down Chimney Rock Road in a marked bike lane, single file, when witnesses said that they saw a light green Ford pickup bear down on them.

"The truck veered over into the bike lane, striking both bicyclists (and) knocking them both off their bikes," Officer Rosalee Stafford said.

One man was killed instantly, and the other was thrown 48 feet, authorities said.

Paramedics rushed the injured man to Ben Taub General Hospital, where he died hours later.

According to witnesses, the driver of the truck didn't slow down, and just sped away into the dark.

"The bicycles took the brunt of the impact, of course, but the vehicle will show some damage," Stafford said.

Police said that the damage would be on the right-front part of the pickup, which witnesses described as a green Ford.

The accident is under investigation.

The victims, Grant Smith and Mark Manus, were co-owners of a popular motorbike store, Honda of Houston.

"They were always a close group. They did a lot of things like riding together -- bicycles and motocross," said Ken Bodenhamer, a customer. "They were like a family group. Everybody was close. They were close with their customers."

The hit-and-run driver could face a failure to stop and render aid charge, a driving while intoxicated charge, or a more serious charge, police said.

Anyone with information is asked to call the Houston Police Department's Hit-And-Run Squad at (713) 247-4065.