In the second instance, Transit police said a young woman called Friday night to report that at 7:20 a.m. PT that morning she was on the Canada Line between Bridgeport and Broadway City Hall stations when she was sexually assaulted by a strange man.
"The train was very crowded. People were pressed very close together. She believes that a man came right up behind her, pressed up against her and then proceeded to grope her leg, her thigh, etcetera," said Transit Police spokeswoman Anne Drennan.
When the woman moved away from the man, he followed her and groped her again.
Drennan said the woman didn't report the incident right away, but decided to come forward after hearing about a similar situation, which took place Thursday morning.
Police still waiting for woman to come forward
On Thursday, a woman was on the Canada Line and witnessed a fellow passenger being groped.
She took a photo and uploaded it to the UBC Confessions Facebook page with a plea for the victim to come forward to transit police.
Drennan said police still haven't heard from the woman involved in the Thursday incident, but confirmed the alleged assailant is known to them and could be charged if the woman comes forward.
She said while transit police can't be sure of a connection, there is a possibility the two incidents are connected.
Drennan said anyone who finds themself in a similar situation should loudly tell the perpetrator to stop.
"In a situation like this, where there are a lot of people around, so you're in a fairly safe setting, in other words it isn't just you and a suspect, than you do call attention to it," she said.
"In a very loud voice just say 'Stop touching me. Move away from me. Don't touch me anymore,' that kind of thing. Usually that stops the suspect in his tracks."