Iran open to talks over its ballistic missile programme: sources

By Parisa Hafezi, Jonathan Saul and John WalcottANKARA/LONDON/WASHINGTON (Reuters) - Iran has suggested to six world powers that it may be open to talks about its ballistic missile arsenal, seeking to reduce tension over the disputed programme, Iranian and Western officials familiar with the overtures told Reuters.  Tehran has repeatedly vowed to continue building up what it calls defensive missile capability in defiance of Western criticism, with Washington saying the Islami