VIGO COUNTY, Ind. (WTHI) - Leaders say two different phone calls were to blame for a lockout at Terre Haute South Vigo High School.
It happened on Monday.
Vigo County School Corporation leaders say they received two threatening, but very vague, phone calls.
As a result, the school went into lockout mode.
That means students could come and go, but visitors could not.
For students, it was business as usual, however, there was more police presence on school grounds.
Booker T. Washington was also impacted by the lockout because the two schools are physically connected.
"We're taking this seriously, but we believe there's no direct threat to student safety at this time," Bill Riley, from the school corporation said.
Officials say the phone calls had out of town numbers.
The school is working with police to track down the source.