Two teens face charges of attacking a woman on a Red Line train with the victim’s own groceries, including busting her nose with a pear.

“This is inexcusable conduct that can undermine the public’s confidence in its ability to use public transportation safely and efficiently,” Suffolk DA Kevin Hayden said in a statement Tuesday.

“Public transportation is crucial to the economic viability of our region, and when something like this happens — a passenger being set upon, unprovoked, and wounded in the process — it’s an assault not just on them, but on the entire system.”

Saul Diaz, 18, was charged in municipal court in South Boston with unarmed robbery and assault and battery with a dangerous weapon. An unnamed juvenile offender, a 16-year-old girl, faces similar charges. The pair were arrested on Friday based on evidence prosecutors say police obtained from surveillance camera footage.

Judge Michael Bolden released Diaz to home confinement. Diaz is allowed out on weekdays during school hours to attend school. Diaz is scheduled to return to court on June 21 for a probable cause hearing.

MBTA Transit Police responded to the Broadway station platform a little before 3:40 p.m. Thursday and found the 21-year-old alleged assault victim sitting on a bench crying. She said she had been on an outbound train when a female member of a group of teens arguing with somebody turned toward her and said, “What the (expletive) are you looking at?”

When the group of teens left the train at Broadway station, according to prosecutors, the girl who spoke to her earlier and Diaz grabbed the victim’s bag of groceries and dumped the contents on the platform before picking up objects and pelting the victim with them.

The 21-year-old victim was transported to Tufts Medical Center for injuries, including injuries to her nose which was swollen and bleeding when police arrived.

Just the day before this alleged grocery assault, a man at the Orange Line’s Massachusetts Avenue Station asked another man for money and to borrow his cell phone and then — when the victim denied these requests — punched the man in the face, according to the Transit Police.

The police on Friday issued the suspect’s photo and asked for public’s help in finding him. Anyone with any information is asked to call investigators at 617-222-105.