Local clergy are on guard but say they aren’t letting ISIS-inspired calls to attack U.S. churches scare them this Christmas season, urging their flocks to celebrate as they would and show “courage” amid an unstable time. 
 
 “Christianity is about courage,” the Rev. Thomas E. Conway of St. Anthony Shrine said yesterday. ||||| Story highlights There are no known specific, credible threats 
 
 The bulletin was issued out of an abundance of caution 
 
 (CNN) Federal authorities warned Friday that ISIS sympathizers "continue aspirational calls for attacks on holiday gatherings, including targeting churches." 
 
 The bulletin was issued by the FBI and Department of Homeland Security and issued to law enforcement agencies and private security companies around the US. 
 
 There are no known specific, credible threats, US law enforcement officials say. The bulletin was issued out of an abundance of caution given the public nature of the posted threats and the holiday season. 
 
 The bulletin was sent Friday to law enforcement after pro-ISIS websites had published a publicly-available list of churches in the United States. 
 
 The bulletin also describes the different signs of suspicious activity law enforcement should be aware of. 
 
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– The country's law-enforcement agencies are being asked to be extra vigilant this holiday weekend after a list of US churches was published on pro-ISIS websites, CNN reports. In a warning issued Friday, the FBI and Department of Homeland Security say ISIS supporters "continue aspirational calls for attacks on holiday gatherings, including targeting churches." According to the Boston Herald, the FBI is looking into the "credibility" of the threats, and none are specific so far. “We continue to work closely with our federal, state, and local law enforcement partners should there be any potential threat to public safety,” CBS New York quotes the FBI as stating. CNN reports the warning was issued "out of an abundance of caution," and the list of US churches is publicly available. Meanwhile, religious leaders in Boston say their followers should show "courage" in celebrating and worshiping as normal this Christmas. “Come to church like you always planned," Rev. Mark Scott tells the Herald. "Church is the safest place you can be."