Nationwide campaign aims to keep order and 'protect publics interests,Chinese police have solved more than 400 cases involving hackers and detained more than 900 suspects in a nationwide campaingn, the Minstry of public Security said on Thursday.The ministry has high-lighted crackdowns againist online crimes and developed a series of efforts to fight such activity as the internet develops rapidly and the public is increasingly hurt by such crimes according to a minstry stament.In the six-month campain,Chinese police mainly fought those who invaded websites,made and spread virus to steal from online banks and used to defruad others, the statement said.