reporter jeff begay shows you how they are working together to make sure everyone is safe leading up to election day. >> reporter: u.s. authorities are taking this threat seriously while assessing the credibility of the intelligence. but counterterrorism officials across the country have been alerted out of an abundance of caution. law enforcement sources tell cbs news the threat comes from al-qaeda and intelligence points to attacks taking place in new york, virginia. isolexes day approaches, federal law enforcement is planning for several wide receivers case scenarios. earlier this week a polling place was seen as attractive targets for lone wolf attacks for individuals motivated by extremist ideologies. a senior fbi official says the bureau as well as the department of homeland security are working closely with federal, state, and local identify potential threats. it is not unusual for there to be an increase in the volume of threats leading up to significant events like holidays or an election, and officials say it is important to investigate those threats thoroughly. jeff begay,