41.   Black-clad security officials roamed the roof of the White House, scanning the skies for a possible attack.

42.   A former Lockheed security official agreed.

43.   A meeting between security officials from the two sides was to take place late Tuesday night.

44.   A Microsoft security official said the company had decided to publicize the potential threat to allow computer users to be vigilant for an attack.

45.   A Palestinian security official speculated that Ali may have been in a car accident, or hit by a car, and driven to a hospital.

46.   A local militia and Palestinian security officials joined the villagers in shooting, Palestinian witnesses said.

47.   A recent edition of the weekly newspaper Nedljni Telegraf, considered to have close contacts with state security officials, suggested a partial answer.

48.   A Palestinian security official said several Islamic Holy War members were arrested in the West Bank on Friday night.

49.   A senior Taliban security official, Mullah Akhter Mohd Osmani, was involved in the talks, he said.

50.   A Palestinian official who declined to be named said that Palestinian security officials were to meet their Israeli counterparts on Wednesday to explain the plan.