A Palestinian suicide bomber blew himself up at a crowded train station in central Israel, killing a security guard who tried to prevent him from entering the station. The bomb wounded 13 bystanders during the busy morning rush hour in the town of Kfar Saba. Medics said that at least two of the injured were in serious condition. Police said casualties would have been greater if the security guard had not stopped the bomber at the station entrance. The bomber died in the attack. A man identifying himself as a member of the al-Aqsa Martyrs' Brigade, a militant group linked to Yasser Arafat's Fatah movement, said the group had carried out the attack. In a call to the Associated Press, the man named the bomber as 18-year-old Ahmed Khatib from the Balata refugee camp near the West Bank city of Nablus.