NEW YORK (CBSNewYork) —  The man who allegedly attacked a 71-year-old woman on a the subway Monday morning is now in custody, sources told CBS2.

Carmen Rivera was slashed in the face as she was sitting on the D train pulling into the Broadway-Lafayette Station at around 7 a.m., police said.

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“I take that train every morning,” Rivera exclusively told CBS2’s Valerie Castro Monday. “It was somebody I didn’t even know.”

Rivera said she didn’t expect any trouble before she was attacked, CBS2’s Hazel Sanchez reported.

“I guess he had a blade, a small blade,” she said.

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According to Rivera’s sister, Amelia, Rivera initially told her family she cut her face while on the job because she didn’t want her family to worry. Rivera, a grandmother and mother of three, makes clothing samples for a living.

“That’s her nature. That’s her nature,” Amelia Rivera said. “That’s the way she is. I get angry with her. I say what’s the matter with you? Wake up!”

Rivera needed 30 stitches to close the 4-inch cut on her left cheek, but she didn’t let the assault stop her from getting on a train again and going back to work on Tuesday.

“I leave this problem to God,” Rivera said. “Because he’s got to answer to God for everything that he’s done.”

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The attacker is described as a Hispanic man around 25 years old, standing 5′ 10″ with a thin-to-medium build, according to police. Police said the suspect was wearing a dark jacket, a red hoodie and sweatpants.