Authorities released the video clip Thursday and pleaded for members of the public to help them identify the man as the desperate search for Adriana Coronado intensified in Texas.

The teen, a ninth-grader at Mayde Creek High School, vanished sometime after 1 a.m. Saturday in the Houston suburb of Katy, according to an Amber Alert. The remains of her father, Caesar Vladimir Coronado, were located the following day in rural Walker County.

“We are hoping that someone observes something,” Walker County Sheriff Clint McRae said at a news conference Thursday, according to the Houston Chronicle.

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McRae told reporters that the search for Adriana was “intensely underway,” adding, “Our goal is to locate her alive, of course.”

Investigators believe the teen might have been with her father during the time of his apparent homicide, McRae said earlier this week. They are working under the assumption that she was abducted, and the National Center for Missing and Exploited Children said she “is believed to be in grave or immediate danger.”

The man in the video is a “person of interest” in the missing teen’s case, according to the Associated Press, which noted that even though viewers can’t make out the man’s face, McRae, the sheriff, is hopeful he can be identified another way.

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“This is going to be crucial in solving this case,” the sheriff said.

Adriana Coronado is about 5 feet tall, with black hair and brown eyes, according to the Amber Alert. Authorities say she wears black-framed glasses.

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The Chronicle reported that Texas EquuSearch is now involved in the effort. A Child Abduction Rapid Deployment team from the FBI was also deployed, a spokeswoman for the agency’s Houston field office told The Post.