Four people have been killed and more than 1,000 more arrested. Protesters saying they won't stop until gas prices come down or Mexico's president resigns.
As weekend demonstrations in Mexico turned violent, Barbie Hartnet listened to gunshots outside her window.
"I was in my apartment by the border and could here everything and it was scary."
Sunday night crowds threw rocks at police and blocked a train heading into Arizona.
"I was scared. I was just trying to take cover and saw a bunch of ppl shouting, yelling, gunshots in the air," said Joshua Castro.
Monday morning, the train damaged by protesters, rolled into the border gate. A border patrol officer jumped on board to stop it.
The anger is throughout Mexico. People are angry the government ended oil and gas subsidies.
Prices jumped last week. A liter of gas equal to a days wage in some places. Those problems made worse for Mexicans by the low value of the peso since the election.
Hartnet has dual residency and splits time between Nogales and Tucson. She says most of those now shouting loudest don't have that luxury.
"People have to feed their families and stuff. It's good for the Americans that go over there shopping but not for the people that live there."
While many Americans say Nogales, Sonora is calm, quiet and safe today, the Deconcini Port of Entry has been closed twice since Wednesday.
The Mariposa Port of Entry hasn't experienced any stoppages because of the protests.