Will They or Won't They? Iran Talks Clock Is Running Out

Iran and six world powers buckled down on Tuesday in a last-ditch attempt to hammer out a nuclear deal with less than 24 hours to go before a self-imposed deadline. Diplomats from Iran and the so-called P5+1 — the U.S. Talks over the past week in Switzerland have intensified as the midnight Tuesday deadline (6 p.m. ET) approached, with all sides swinging between cautious optimism and warning that differences remained which could scupper a long-awaited deal to end a decade-long nuclear standoff.