Three students were robbed at gunpoint while on a lunch break from the Bronx High School of Science on Monday afternoon, cops said.

The teens were on Jerome Avenue a few blocks from the school when a man with a gun demanded their property around 1:30 p.m., authorities said.

The suspect made off with an iPhone from one student and a school ID and a MetroCard from another, according to law-enforcement sources.

The students went back to the school and reported the incident. The high school went into lockdown for 30 minutes.

Cops were looking for the suspect Monday night.