Four current and former staff members of the popular British tabloid The Sun and a policeman were arrested today as part of the continuing investigation into corruption that arose out of phone hacking at News Corp’s shuttered News Of The World, Reuters reported. The five arrests involved suspected payments by journalists to police officers for information. Police also searched London offices of Sun publisher News International, the British arm of News Corp, whose Management and Standards Committee said today’s operation was the result of information it had passed to police. Said a Sun reporter, who asked not to be identified: “Everyone is a bit shocked, there is disbelief really. But there is a big difference between phone hacking and payments to the police.” Today’s operation raises to 13 the number of arrests in the police bribery probe, which is separate from the phone-hacking inquiry that has resulted in three criminal investigations.