ISLAMABAD — Peace talks between Pakistan and Afghanistan in Istanbul have ended without agreement, with the sides trading blame for the breakdown in negotiations aimed at easing border tensions and upholding a fragile ceasefire, officials said Saturday.

Tensions have escalated in recent weeks following deadly border fighting that killed dozens of soldiers and civilians. The violence erupted after explosions in Kabul on Oct. 9, which Afghanistan's Taliban government said were drone strikes conducted by Pakistan and vowed to avenge. The clashes subsided after Qatar brokered a ceasefire on Oct. 19, which remains tenuously in place.

Afghanistan's government spokesman, Zabiullah Mujahid, blamed Pakistan for the talks' failure, saying that “Pakistan’s demands in the negotiations were unreasona

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