According to Reuters. a suicide blast in Kabul killed at least 48 people on Wednesday, the latest in a wave of attacks that have killed hundreds of civilians, soldiers and policemen over recent days.The explosion, targeting an educational center in the west of the Afghan capital, killed dozens of teenagers studying for a university entrance examination. Doctors at city hospitals, where people had gathered to try to find relatives who had been studying at the center, said many of the victims were severely burned.