By james art 
A Washington state woman has been charged in connection with the fatal shooting of a U.S. Border Patrol agent in Vermont, where authorities have been monitoring her for days, and a German passenger who also died in the roadside shootout.
The FBI announced the arrest of 21-year-old Teresa Youngluth on Friday, four days after the deaths of Border Patrol agents David Maland and Felix Bauholt in Coventry, about 20 miles (32 kilometers) from the Canadian border. She was charged with one count of use of a deadly weapon while assaulting a Border Patrol agent and one count of use and discharge of a firearm during and in connection with that assault.
An FBI affidavit filed in U.S. District Court shed some light on the events leading up to the fatal encounter, but many questions remain.
Here are some things you should know:
Before the shooting
Youngblut and Baukholt were staying at a hotel in Lyndonville, about 30 miles (48 kilometers) south of the shooting scene, on Jan. 14 when a hotel worker contacted law enforcement after seeing the couple wearing black tactical gear and Youngblut , carrying a gun, according to gun, according to gun, according to gun, according to gun, according to gun, according to gun, according to gun, according to gun, according to gun to the declaration. State police and Department of Homeland Security investigators tried to interview the duo, who said they were in the area looking to buy property, but they declined to have a lengthy conversation, the FBI said.
On Sunday, investigators saw the pair walking in the center of Newport, just north of Coventry, wearing similar tactical clothing. And about two hours before the shooting, investigators watched Bauholt leave a Walmart in Newport with two packages of aluminum foil, get into the car and wrap something in the passenger seat.
Investigators later found cell phones with foil in the car.
The encounter with the highway
According to the FBI affidavit, Youngblut was driving Baukholt’s car when a border agent pulled it over on Interstate 91 to conduct an immigration inspection. At the time, Bauholt appeared to have an expired visa, according to a Department of Homeland Security database, but investigators later confirmed his visa was current, the FBI said Friday.
Youngblut got out and opened fire on Malland and other officers without warning, the FBI said. Baukholt tried to draw a gun but was shot, according to the filing. At least one border agent fired at Youngblut and Baukholt, but authorities have not said whose bullets hit whom.
The contents of the car
Authorities who searched the car after the shooting found a ballistic helmet, night vision goggles, respirators and ammunition, the FBI said. They also found a package of shooting targets, including some that had been used, two-way radios, about a dozen “electronic devices,” travel and lodging information for multiple states, and a logbook.
The suspects
Authorities have not released information about Youngblut other than her name, age and home state.
A man who reached a listing for Youngblut’s family in Washington by phone identified himself as his grandfather and declined to comment. No one answered the door at multiple Washington homes associated with Youngblut’s name, and neighbors declined to comment.
The public defender’s office, which will represent Youngblut, did not respond to a voicemail seeking additional information.
The fallen agent
Malland’s aunt, Joan Malland, declined to comment on the arrest on behalf of her family. The family issued a statement expressing gratitude for the outpouring of support.
Relatives describe Maland as a dedicated public servant who passed on promotion opportunities to continue working on the ground. He was a veteran of the US Air Force and worked as a Border Patrol agent for nine years, including in Texas, before heading to the northern border.