Police in charge of protecting Congress warned of a possible plot by a militia group to breach the U.S. Capitol on Thursday amid lingering security concerns following the attack on the building in January.Noting that the intelligence on the plot is taken "seriously," the U.S. Capitol Police Department said Wednesday it has "already made significant security upgrades" including boosting manpower to ensure the protection of Congress.The police said in a press release that the militia group in question is "identified," but did not elaborate.The Capitol was attacked on Jan. 6 by a mob supportin…READ FULL ARTICLE