Police continue to search for missing Allentown teen and man

The search continues for a 16-year-old girl and a 45-year-old man. Police say they have been missing since last Tuesday.

Investigators say the case is getting national attention and they believe the two know police are looking for them.

READ MORE: Cops: Man got girl out of school 10 times; now both missing

Police don't want to tip them off. It's a bizarre missing person investigation. A teenage girl is believed to be with a 45-year-old man. Allentown police said in a press release that 16-year-old Amy Yu and 45-year-old Kevin Esterly have been missing since Tuesday of last week and that local, state and federal agencies are all involved in the search.

According to the Associated Press, Esterly signed the girl out of Lehigh Valley Academy High school ten times before the two went missing and that the teen had changed her school documents listing Esterly as her step-father. According to police, the sign-outs happened between November 13th and February 9th without her parents' permission. A day after they disappeared Allentown police put out a missing person alert and a warrant for Esterly's arrest for allegedly interfering with the custody of a child.

Yu's mother told WFMZ that she found out what had been happening when she went to pick her daughter up from school on February 9th and school workers said she had left with her step-father. Investigators say the two could possibly be in a two-door 1999 red Honda Accord with Pennsylvania tag KLT 0529.

Police believe the car may have been parked in the Philadelphia area.