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Luis Viga was eating tortas at a Mexican restaurant in Bristol Borough one day in March when his lunch partner got the call.

“Let’s go. We have to go,” the man told the puzzled Viga.

Immigration and Customs Enforcement agents had just been spotted raiding an apartment complex nearby.

The men paid for their meals and drove 10 minutes to the Levittown house of the man whose warehouse Viga had drywalled. For the next eight hours, they hunkered down.

Viga, 30, is an undocumented construction worker from Mexico. So is his client. What was supposed to be another day mounting and taping drywall for Viga suddenly became a tense waiting game, confirming the rumors of ICE arrests and biding time, not knowing for sure when the coast would be clear to drive home.

Amid President Trump’s calls for tougher tactics against undocumented immigrants and recent reports of immigration raids in Pennsylvania, Viga and 50,000 other undocumented immigrants in Philadelphia have grown more cautious in going about their day-to-day lives.

Philadelphia saw the biggest percentage increase in the nation of arrests of immigrants who had never committed any crimes: 356 between Jan. 20 and March 13, six times as many as last year during the same period.

More than a dozen undocumented immigrants interviewed by The Inquirer and Daily News noted a higher sense of anxiety within the undocumented community in the Philadelphia area since Trump won the presidency last year.

Undocumented parents grapple with the possibility of being separated from their U.S.-born children, who are American citizens. Their children struggle to understand their place in this country. Young people who crossed the border as children and are living in Philadelphia under the protection of Deferred Action for Childhood Arrivals (DACA) are unsure what will become of the Obama-era policy that allows them to work and study here.

Many are taking public transportation for fear of being pulled over in cars, detained, and possibly deported. Others have stopped going out at night, avoiding unnecessary encounters with authorities. A few families have reportedly left the country.

Yet, many highlighted what they consider a silver lining in the growing frenzy: More undocumented immigrants have engaged in community organizing, increasingly interested in educating themselves about their rights here.