The number of those killed in a blast that hit Afghanistan’s eastern city of Jalalabad rose to 17, while 30 suffered various injures, 1TV broadcaster reported.
Previously, governor's spokesperson Attaullah Khogyani reported that four people were killed and 10 injured after a powerful blast.
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As a result of the explosion, several buildings around Mukhaberat square were damaged, the spokesman said.
No group has yet claimed responsibility for the attack.
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Earlier in the day, Afghan President Ashraf Ghani paid a visit to Jalalabad, where he gave a speech in which the president confirmed the government's readiness to negotiate with the radical Taliban movement.
Afghanistan is in a state of political and social turmoil, with government forces fighting against a Taliban insurgency and other radical groups acting in the country.