A woman was injured when she ended up on the tracks in a downtown Metro station Friday night, authorities said.

It was not clear how the woman came to be on the tracks in the Archives Station, said Metro spokesman Dan Stessel. The nature of her injuries was not specified.

Stessel said a Yellow Line train halted short of where the woman was.

The incident occurred just before 7:30 p.m. and trains were delayed on the Yellow and Green lines for about a half hour, Stessel said.

He said the matter was under investigation.