The Associated Press reported Sunday morning that 12 people were arrested as part of the investigation.
A University of Dayton official said staff there are reaching out to any students who are studying in an abroad program.
So far, all students from Miami University who are in study abroad programs are safe and accounted for, according to MU spokeswoman Claire Wagner.
Police: death toll from London terror attacks has risen to 7 dead; nearly 50 others were injured.
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