Two Uniondale teenagers tried to steal a youth's cellphone at knifepoint, according to Nassau County police, who also said they are looking for a third suspect in Monday's alleged attempted robbery.

Luis Escalante, 18, of 129 Marvin Ave., and Carlos Ramirez, 17, of 1067 Midland St., face charges of first- and second-degree robbery after they and a third suspect surrounded a boy, 15, on Gilroy Avenue at about 11:30 a.m., police said Wednesday.

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The third teen, armed with a knife, demanded the boy give up his cellphone, placing the weapon at the victim's side, police said.

The victim turned over his phone, and the three suspects fled on bicycles, police said.

On Tuesday, First Squad detectives noticed Ramirez riding his bicycle on Marvin Avenue; he fled, entering a rear yard, police said.

Ramirez and Escalante were found shortly before 7:30 p.m. in a yard at on Marvin Avenue, where they were arrested, police said.

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Each is scheduled to be arraigned Wednesday at First District Court in Hempstead.