A massive data breach hit PSNI, exposing officers' sensitive data.A massive data breach hit PSNI, exposing officers' sensitive data.

Spreadsheet error led to online exposure, causing security worries in a terrorism-prone region.

FOI request mishandling led to unintended data release.

Top officer apologized, stressing breach's distressing nature amid terrorism threats.

Urgent probe urged for safeguarding and prevention measures.

Historical threats worsen breach concerns; officials and ICO respond.