UPDATED: February 15, 2019  10:52 AM

ARLINGTON, Texas (CBSDFW.COM) – Arlington police responded to Sam Houston High School in regards to a fight at around 9 a.m. Friday. A school resource officer had reported seeing someone reach into their waistband, as if to draw a weapon, during the fight.

The school located at 2000 Sam Houston Drive was placed on lockdown, according to the Arlington Independent School District, as police investigated the incident.

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Students were held inside the building for about an hour and no one was allowed to come or go on the campus.

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The lockdown was lifted after police determined the weapons threat was “not credible”. Police said despite the earlier report they received, there was no weapon seen or used.

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Arlington ISD administrators sent a tweet saying that all students were safe and that classes would “resume as normal.”