By Beth Germano, WBZ-TVBy Beth Germano

ARLINGTON (CBS) – A blog threatening members of Congress in the wake of the Tucson, Arizona shooting has prompted Arlington police to temporarily suspend the firearms license of an Arlington man.

It was the headline “1 down and 534 to go” that caught the attention. “One” refers to Congresswoman Gabrielle Giffords, who was shot in the head in the rampage, while 534 refers to the other members of the U.S. House and Senate.

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Police are investigating the “suitability” of 39-year-old Travis Corcoran to have a firearms license

WBZ-TV’s Beth Germano reports.

“We certainly take this as a credible threat, and credible until we prove otherwise,” said Arlington police Captain Robert Bongiorno.

In his blog Corcoran writes, “It is absolutely, absolutely unacceptable to shoot indiscriminately. Target only politicians and their staff and leave regular citizens alone.”

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Travis Corcoran of Arlington

Police visited Corcoran’s home and found a “large amount” of weapons and ammunition. Sources told WBZ-TV that 11 guns were removed.

The length of the suspension, or whether Corcoran’s license will be revoked will be determined by the outcome of the investigation.

Corcoran runs an online comic book business, HeavyInk.com, in Arlington. His views prompted comic book writers like Paul Cornell to tweet his fans, “I can’t stop someone selling my books, but please don’t buy them from HeavyInk.” And another from writer Gail Simone, “You have my pity. May you grow a soul someday, because you desperately are in need of one.”

Corcoran, who has no criminal history, has not been arrested and does not face any charges. Arlington police saying they are working with the Capitol Police in their investigation, and members of the Massachusetts congressional delegation have been alerted.

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WBZ-TV’s Sera Congi contributed to this report.

Beth Germano