For the second time in as many weeks, the credibility of an intelligence threat that led to a terror scare in a major metropolitan city in the United States is being questioned. Two major car tunnels were closed in Baltimore Tuesday following information gleaned from an informant in FBI custody. But intelligence officials now say the informant’s warning appears to have been an attempt to exact revenge on a Maryland resident he named as one of eight suspects for being involved with his girlfriend. All eight suspects were Egyptian-born Maryland residents. Last week, a terror scare led to a heightened alert and increased security presence on New York City’s subways. Officials later conceded the intelligence that led to the threat warning was a hoax.