Four people have been charged following an assault on a U.S. Border Patrol agent in Derby Line, near the Vermont-Quebec border, federal prosecutors said Tuesday.

Alexsandre Da Silva, 32, Jenete Maria Andrade-Valenca, 53, Evaldo Ferreira Pinto, 33, all citizens of Brazil, were discovered on a street in Derby Line at around 2:15 a.m. Monday, the U.S. Attorney's office said.

None of them had paperwork to enter the U.S., and when the agent tried to take them into custody they fled, the office said.

The agent tackled Da Silva, who then assaulted the agent, throwing him over a guard rail, federal prosecutors said. The agent then fired two shots at the suspects. There were no injuries.

Andrade-Valenca were arrested in Derby Line and Ferreira Pinto and Da Silva were arrested nearby in Stanstead, Quebec. Another man, Victor Botelho, 31, of Falls River, Mass., was arrested as he tried to drive into Canada.

According to court records, Ferreira Pinto and Da Silva were driven to the border by Botelho so they could enter Canada. They walked into Canada to meet Andrade-Valenca and guided her into the U.S. to the car, court records said. She planned to travel to New York City, the records said.

Da Silva has been charged with assaulting the agent, conspiracy to smuggle aliens and illegally entering the U.S. Ferreira Pinto is facing smuggling charges and re-entering the U.S. after being removed from the country.

Botelho, who was released on conditions Tuesday, is charged with smuggling, and Andrade-Valenca with illegally entering the U.S.

The U.S. plans to seek extradition of Da Silva and Ferreira Pinto, federal prosecutors said.