By Kathryn Westcott BBC News Online

On 18 June, Palestinian student Mohammed al-Ghoul boarded a rush-hour bus in Jerusalem. Once inside the bus packed with children, students and commuters he detonated the nail-packed explosives strapped around his body.

He killed 20 people including himself and caused terrible injuries to many more.

The horror of the event captured headlines around the world that day. But as with other such bombings the world's attention moved on and the attack became another entry in the long list of tragedies that have shattered lives.

One month on, BBC News Online revisits the event to tell the stories of some of those still trying to come to terms with the way their lives were affected on that morning, and asks what led the bomber to destroy so many lives.

Shiri Negari, 22, boarded the doomed 32A after missing her normal bus to work. She died some two hours later after a frantic fight by surgeons to save her.

Moshe Gottlieb, 70, left home to spend the morning with disabled children. "Take care and be safe," his wife said. Shortly afterwards, she watched the bus he was on blow up.

Rescue worker Yonatan Yagodovsky was on his way to work when he heard the urgent, haunting, tone of his pager. It was a special signal indicating a major incident with many casualties.

Mohammed al-Ghoul's family describe him as a quiet, studious man. They didn't know that for some time he had been planning to kill Israelis.

Additional reporting by Atef Saed in the al-Farra refugee camp.