NEW : Police chief says only FAI parcel contained an explosive . The messages read : `` We have decided to make our voices heard again , in words and deeds . Chief : ` ` The alarm system has worked '' An anarchist group claims responsibility for the bombings at the Swiss , Greek embassies . A Italian official disputes an Swiss minister 's claim that the bombs originated in Spain .
NEW : Police chief says only FAI parcel contained an explosive . Chief : `` The alarm system has worked '' An anarchist group claims responsibility for the bombings at the Swiss , Greek embassies . A Italian official disputes an Swiss minister 's claim that the bombs originated in Spain .