Police catch high school teacher in undercover sting operation for engaging in explicit chats with ‘teen girl’ on the internet

An Oregon high school teacher is in custody following an undercover operation that resulted in his arrest for online sex offenses involving minors.

The Portland Police Bureau reported that Oscar Armando Ramirez, 36, engaged in sexually explicit dialogues with an individual he thought was a 13-year-old girl when he was employed as a teacher at a local high school.

Unbeknownst to Ramirez, he was conversing with an undercover law enforcement officer who was pretending to be an underage individual as part of a sting operation aimed at apprehending online predators.

Oscar Armando Ramirez was working as a high school teacher when police say he exchanged lewd messages with an undercover police officer posing as a minor.  (iStock)

The investigation did not reveal any crimes involving students at the high school or any other children, police said.  

Ramirez pleaded not guilty to the charges and is set to return to court on Tuesday, according to KOIN 6.

Fox News Digital was unable to immediately locate an attorney for Ramirez.