Kerry says Iran must be serious at nuclear talks

Speaking to reporters at the State Department, Kerry said in his first public comments on the matter since taking office last week that Iran knows full well what it needs to do to prove its nuclear intentions are peaceful as it claims.

If it does, Kerry said the international community is prepared to respond positively. If not, he said Iran will only face increased international isolation. He reminded the Iranian leadership that President Barack Obama has taken no options off the table, including military force, to prevent Iran from obtaining a nuclear weapon.