ISLAMABAD — Pakistani security forces killed 20 Pakistani Taliban insurgents in raids on hideouts in the northwest region bordering Afghanistan, the military said Monday, as tensions between the two countries escalated.

Separately, militants including a suicide bomber tried to storm a cadet college in Wana, a city in the South Waziristan district also in the northwest, triggering a gunbattle that killed at least two of the attackers, the military said.

Pakistan and Afghanistan blamed each other for the collapse of a third round of peace talks in Istanbul over the weekend. The negotiations, facilitated by Qatar and Turkey, began last month following deadly border clashes that killed dozens of soldiers and civilians on both sides.

Pakistan's military described the slain militants as “Khwa

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