Six African teenagers who competed in the international robotics competition in Washington, D.C. this week have vanished, and two of the teens were seen crossing into Canada, D.C. police say. 

The members of the robotics team from the eastern African country of Burundi, who are 16, 17 and 18, disappeared Tuesday after they took part in the FIRST Global Challenge robotics competition.

The Metropolitan Police Department has received reports that Audrey Mwamikazi, 17, and Don Ingabire, 16, were seen crossing into Canada, spokeswoman Aquita Brown said Thursday morning.

Police say they have no indication of foul play in their disappearance. Organizers of the contest say it appears they chose to leave.

Four boys and two girls are missing. Police identified them as: Audrey Mwamikazi, 17; Aristide Irambona, 18; Kevin Sabumukiza, 17; Don Ingabire, 16; Nice Munezero, 17; and Richard Irakoze, 18.

The teens all are being sought by D.C. police as missing people. Anyone who sees them is asked to call 202-727-9011 or send a text message to 50411.

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Source: NBC