31.   He had been a half-block from the north tower when it fell.

32.   He is restoring the chapel interior in the north tower, which is decorated with murals he estimates are a century old.

33.   He looked up and saw people high in the north tower.

34.   He rushed into the north tower and helped people down, but when he emerged to get a new respirator, only one remained, his partner recalled.

35.   He was among the terrorists that sent the American Airlines flight into the north tower of the World Trade Center.

36.   He was last seen running toward the north tower after helping guide dozens of workers to safety.

37.   He worked for Cantor Fitzgerald, a financial services company on the upper floors of the north tower.

38.   His remains had been found near the north tower, and identified.

39.   In January, the search moved to the north tower, and in February to areas north and west.

40.   In the north tower, pockets of near-silence extended four floors above and one floor below the impact zone.