HARPER WOODS, Mich. -

A robocall in a Spanish dialect that went out Sunday afternoon to more than 100 Harper Woods high school students caused some concern over safety when word spread that it could be a threat.

The call went out about 2 p.m. to junior students.

“My wife called the Harper Woods precinct. They said it was a mistake or something,” said parent Sergio Stephen.

Director of Public Safety Jim Burke said students began using social media to spread the rumor that there was a bomb threat. But, Burke said, there was never any danger.

Superintendent Todd Biederwolf said the confusion happened when the district intended to send out a message about practice ACT testing.

"Early this morning, we were able to ascertain the source of the message and that it represented no threat. It originated from the district,” he said.

Officials are still looking into what caused the glitch.

A second call Monday morning, this time in English, was pushed out to students and parents explaining the mishap.

Classes were held normally on Monday.