Twenty policemen were killed yesterday when a Taliban suicide bomber struck their base in Kabul Monday, officials said, just days before a fresh round of international talks aimed at reviving dialogue with the Islamist group, reports AFP. Scores of people were also wounded as the attacker blew himself up in a queue of police officers waiting to enter the base.  The carnage marks one of the worst attacks on Afghan forces in recent months, despite a renewed international push to restart formal peace talks, which stalled last year.