1.   The deepest penetration was in newspapers and sugar-refining.

2.   There were no casualties, but it was the deepest penetration yet of mortar fire from Gaza, and Israeli officials called it a serious escalation by the Palestinians.

3.   South Korea was mesmerized by the event, the deepest penetration of North Korean agents uncovered in more than a decade.

4.   South Korea was mesmerized by the event, the deepest known penetration by North Korea in more than a decade.

5.   South Korea were mesmerized by the event, the deepest penetration of North Korean agents uncovered in more than a decade.