Authorities found two people dead inside a college near Dallas on Wednesday afternoon while responding to reports of a shooting at North Lake College.

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Irving police spokesman Officer James McLellan said authorities believe the gunman was among the two found deceased around 1 p.m. CDT. The attacker is believed to have acted alone.

The police department warned people away from the school after receiving reports around 11:30 a.m. of an “active shooter.”

North Lake College officials said the school was placed under lockdown.

The school is just outside Dallas and part of the Dallas Community College District.