MCLEAN, VA.—Organizers of an international robotics competition in the U.S. capital believe the disappearance of six teens from Burundi may have been “self-initiated.”

As the competition was wrapping up Tuesday, their chaperone discovered his kids were missing. He looked in the college dorms where the six teens — ages 16 to 18 — had been staying. Their bags were packed and gone. Officers swept through DAR Constitution Hall. They were nowhere to be found.

Police now say that two of the six were seen crossing into Canada, and they don’t suspect foul play with any of them.

Read more: Two Burundi teens reported missing from robotics competition seen crossing into Canada

The team’s coach, Canesius Bindaba, told The Washington Post that he had heard rumours the teens might be planning to stay in the United States. Speaking over WhatsApp from Kenya, a stop on his trip home, Bindaba said he hoped the rumours weren’t true.

“I just tried to build some kind of trust, hoping they were just rumours,” he said. “I feel cheated and disappointed by those who planned this behind my back.”

Police in D.C. posted missing-person fliers Wednesday asking for help finding the teens, who had last been seen at the FIRST Global Challenge around the time of Tuesday’s final matches.

Don Ingabire, 16, and Audrey Mwamikazi, 17, were later seen crossing into Canada, Metropolitan Police spokesperson Aquita Brown said Thursday.

Marilu Cabrera, a spokesperson for U.S. Citizenship and Immigration services, which receives asylum applications, said the agency does not comment on whether specific individuals have sought asylum. Canadian immigration authorities also declined to comment.

The competition, designed to encourage youths to pursue careers in math and science, attracted teams of teenagers from more than 150 nations. It had been in the national spotlight already, thanks to a team of girls from Afghanistan who were allowed to attend after President Donald Trump intervened on their behalf. Twice, their visas had been rejected — an Afghan official said the Americans feared they wouldn’t go home.

Competition organizers learned Tuesday night that the Burundi chaperone couldn’t find his team. FIRST Global President Joe Sestak, a former congressman from Pennsylvania, made the initial call to the police, according to a FIRST Global statement.

“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,” FIRST Global said in a subsequent statement.

The students had been staying in dorms at Trinity Washington University, and had been expected to return to Burundi together on Thursday.

Benjamin Manirakiza, first counsellor at the Burundian embassy, told The Associated Press on Thursday that officials were not aware of the team’s presence in Washington until the chaperone alerted the embassy Wednesday. He said he had no comment on their disappearance.

According to police reports, the teens were travelling on U.S. visas good for one year. The reports say police tried to contact one missing teen’s uncle, but got no response.

The competition’s webpage on Team Burundi says team members were selected from schools in Bujumbura, the capital city. The team’s slogan in Kirundi is “Ugushaka Nugushobora,” which translates roughly to “where there is a will, there is a way.”

In addition to Ingabire and Mwamikazi, the missing teens are Nice Munezero, 17; Richard Irakoze and Aristide Irambona, both 18; and Kevin Sabumukiza, 17.

Hassan Ahmad, an immigration lawyer in northern Virginia not involved in the situation, said that if the teens apply for asylum in the U.S., Immigration and Customs Enforcement could seek to detain them pending removal proceedings. The teens could then seek release on bond and stay in the country while they await their hearing. That can take years. If ICE declines to seek detention, it still can take several years before a formal interview to determine whether an applicant is eligible for asylum.

Oscar Niyiragira, chairman of the United Burundian-American Community Association Inc., said many in the community feel Canada offers better odds for asylum, particularly now that the Trump administration has taken a harsh stance on immigration.

He called the teens’ departure disappointing and said economic impoverishment, rather than political persecution, drives most decisions to seek asylum from Burundi. He said it unfairly tarnishes Burundi’s reputation when people flee and exaggerate fears of political violence.

“Now I’m not saying the government does not commit some crimes. They do,” said Niyiragira, who lives in Louisville, Kentucky. But the situation in Burundi is not nearly as bad as it was in waves of violence in the ‘70s and the ‘90s, he said.

Burundi has been plagued by deadly political violence since April 2015, when President Pierre Nkurunziza’s ultimately successful decision to seek a third term led to street protests. Critics called his move unconstitutional.

More than 500 people have been killed in Burundi, an East African nation of about 10 million people, according to the United Nations. Hundreds of thousands of people have fled the country.

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In January, Human Rights Watch reported that members of a pro-government youth militia had “brutally killed, tortured, and severely beaten scores of people across the country in recent months.” Abuses included driving a knife into the eye of one victim and beating a 15-year-old boy to death, the rights group said, accusing Burundi’s government of being unwilling to restrain youth militia members.

Burundi’s government often dismisses the allegations, saying they are based on false information supplied by the regime’s opponents.

Associated Press reporters Sarah Brumfield in Washington and Eloge Willy Kaneza in Bujumbura, Burundi, contributed to this report.