Threat prompts lockdown at Plano's Clark High School

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Clark High School in Plano was placed on lockdown Friday afternoon after a caller claimed weapons and a bomb were somewhere at the school.

The school was placed on lockdown after the call and students were kept inside their classroom as police searched the entire campus with bomb-sniffing dogs.

However, no devices or weapons were found even after multiple sweeps.

Tilley said the cellphone used to place the 911 call was reported stolen earlier this week. Police said the call was a hoax and an investigation is underway to find out who did place the call.

All students were safe during the lockdown and no one was injured.