Photos of the six missing teens from Team Burundi. (Photo via MPD)

Six teens from Burundi were reported missing this week in D.C., where they were visiting to participate in an international robotics competition. Now, police say that at least two of them have entered Canada.

Currently, D.C. police stress that there is no indication of foul play in the teens’ disappearance.

The six teens—four males and two females ages 16 through 18—were last seen around 5 p.m. on Tuesday near DAR Constitution Hall, and were reported missing shortly after midnight on Wednesday, according to tweets from the Metropolitan Police Department and a statement from First Global, the organization that hosted the competition.

MPD spokesperson Aquita Brown says that none of the teens have been located at this time, though two of them were last seen leaving the U.S. and heading into Canada. She confirms that D.C. police officers are working with Canadian authorities as the investigation continues.

According to a statement from First Global, “there were indications that the students’ absence may have been self-initiated, including leaving all their keys in their mentor/chaperone’s bag and the removal of students’ clothes from their rooms” at Trinity Washington University.

“The security of the students is of paramount importance to FIRST Global, and therefore the organization required at least one adult mentor/chaperone accompany each team from each nation,” says First Global, adding that the Burundi chaperone “had returned to the dormitories where the entire team was staying, thinking that the students were on another bus shuttle.”

The robotics competition officially ended on Tuesday. It included 163 teams of high school students from around the globe, including a team of young women from Afghanistan who were initially denied visas twice, leading to international outcry.