A yet unknown number of Metrorail riders accessing the system at unknown stations were charged peak fares Monday morning even though they traveled during off-peak hours, The Washington Post reports.

Peak fares were charged until 10:30 a.m. instead of ending 9:30 a.m.

Caroline Lukas, a metro spokesperson, discussed the accidental charges withThe Washington Post:

Lukas said she didn’t know what caused the additional hour of peak fares, and she wouldn’t speculate on whether the problems stemmed from the change to daylight saving time.

NBC Washington's transportation reporter Adam Tuss tweeted Monday afternoon that only a few faregates were impacted.

"Metro says its clocks were NOT adjusted to daylight saving time this am," Tuss tweeted.

It's not clear if those faregates were along the Orange Line, or elsewhere in the system.

Metro says all passengers who were overcharged would be credited back their fares next time they enter the rail system.

In November when clocks turned back by an hour, Metro was supposed to stay open until 3 a.m. But the system shutdown instead, leaving some riders stranded.

Were you charged extra for your off-peak ride Monday morning? Tell us in the comments.