Brooklyn gunman Frank James’ sister finds out about his arrest through the mail

The heartbroken sister of Brooklyn subway shooting suspect Frank James said she was “devastated” by the rush-hour chaos – and was horrified to learn of his arrest from a reporter on Wednesday.

Catherine James Robinson, of the Bronx, tensed up after learning from a Post reporter that her 62-year-old brother was being taken into custody by NYPD cops in the East Village.

“Okay, I’ve said enough then,” Robinson told the Post.

When asked for comment on her brother’s arrest, she said, “I don’t know because they said he was just a suspect.”

“I don’t know, I need to find out what happened,” she continued before abruptly ending the call.

James’ sister said in a brief phone interview that she was devastated when she saw photos of her brother on the news and asked police for the public’s help in tracking him down.

“I was devastated, I cried,” Robinson said. “I feel bad, this is my brother.”

Robinson said that her brother was a recluse who was very private and that they hadn’t spoken to each other since their younger sister died a few years ago.

“He kept to himself, he was a loner,” she said. “Yes he was.”

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Robinson had been shown his social media pages – including some full of violent threats – but insisted she had never looked at any of the heinous footage.

“Someone showed me, but I never looked at it,” she said.

James, who has addresses in Philadelphia and Wisconsin, was arrested about 30 hours after allegedly disguising himself as a construction worker and firing 33 shots during the morning rush aboard a Manhattan-bound N train in Sunset Park.

James’ sister briefly refrained from describing their relationship as estranged, but said she was unaware of his charged opinions on race, politics and the threat of gun violence, which he regularly posted online. His Facebook profile was removed on Wednesday after The Post questioned whether it violated content guidelines.

“No, no, no, no, I don’t know anything he got himself into,” Robinson said. “I do not know anything.”

Additional reporting by Oumou Fofana