A computer issue shut down all Metrorail trains twice over the weekend.
Metro says it will have extra staff on hand for Monday morning's commute, as the transit agency tries to figure out what caused Metro's computer system to crash on both Saturday and Sunday.
Twice over the weekend, all of the system's trains had to be stopped because of a systemwide computer issue.
The first stoppage took place Saturday afternoon, and the second happened around 12:30 a.m. Sunday. In both cases, the Metro system was shut down for about an hour.
Dan Stessel, a spokesperson for WMATA, says the computer issue affected Metro's ability to see where the trains were on the lines.
Stessal says the shutdowns were ordered out of an abundance of caution, adding that the signal system, which ensures that trains maintain enough space between them, remained operational.
Metro is still investigating the issue, and will have additional staff posted at key locations this morning to respond quickly in the event of any technical issues.