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Security concerns continue at the Rio Olympics as a bus carrying media had windows shattered by what witnesses believe was gunfire, Reuters reported Tuesday. According to Brazilian paper O Globo (via USA Today), authorities believe the damage to the windows was from rocks.

The bus was traveling on a Rio highway between Olympic venues when the windows shattered

More from Reuters:

"We were shot at. I mean we could hear the report of the gun," said Sherryl "Lee" Michaelson, a retired U.S. air force captain who is working for a basketball publication in Rio.

Michaelson, who is covering the Olympics for Hoopfeed.com, also spoke with Jeff Seidel of the Detroit Free Press and was adamant she heard gun shots. More details of her ordeal were shared through Hoopfeed's Twitter account:

This is just another security scare in a series of many that seem to keep piling up this week, and second that involved members of the media. A bullet struck the equestrian center near where journalists were working Saturday.

Crime has struck the Rio Games in other ways as well.

Two Australian rowing coaches were robbed at knife point, according to reports. So was Portugal's minister of education and even the Rio Games' chief of security was also reportedly mugged after the Opening Ceremony.

The Brazilian government has deployed a security force of 85,000 for the Olympic Games. That has not been enough to keep everyone safe, though.