DUSHANBE, February 8: Some 250 people were killed and 50 injured in an aftershock that hit the same area of northern Afghanistan today where thousands may have died in a mid-week earthquake, the Afghan embassy said.Diplomats at the embassy in the Tajik capital said the latest quake was concentrated on the remote Rustaq district where the initial disaster struck on Wednesday.The diplomats put the overall death toll at about 4,400.They said the aftershock was significant but not nearly as strong as the main quake.Earlier, a spokesman for the Afghan Opposition said in Islamabad that the aftershock had hit the region early today as relief workers arrived to assess the damage from the first earthquake.