MINNEAPOLIS (WCCO) — Crystal police say they are continuing to search an area along the Mississippi River for a 10-year-old boy who has been missing since March 18.

Barway Collins was last seen approaching his apartment building after exiting his school transportation service van.

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The FBI, Minnesota Bureau of Criminal Apprehension and the Hennepin County Sheriff’s Office are continuing to search in and around the Mississippi River, as well as collecting video around the area where Barway was last seen.

Clear Channel will also continue assisting law enforcement by keeping Barway’s photo and reward information on their digital billboards throughout the metro.

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The Jacob Wetterling Resource Center is also assisting by encouraging the public to contact the National Center for Missing and Exploited Children with any information about the case.

Investigators say Barway’s father, Pierre Collins, is considered a suspect in his disappearance after he failed a lie detector test. Police also say there is “strong evidence” that Pierre was near North Mississippi Regional Park around the time his son went missing.

Some attendees at a prayer vigil in Barway’s honor Saturday accused Pierre of being involved in the disappearance, yelling, “Clear you conscience,” and, “He knows where the kid is.”

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Pierre claims he has nothing to do with the disappearance, and denied past child abuse allegations with WCCO. He also maintained his innocence on Nancy Grace’s cable news show.