BAGHDAD (Reuters) - Iraqi soldiers backed by U.S. helicopters have killed several suspected insurgents and seized 131 more in a dawn raid, capturing tons of explosives earmarked for attacks on the holy city of Kerbala, officials say. "It was a surprise operation based on intensive surveillance by military intelligence," Defence Minister Hazim al-Shaalan told Reuters on Saturday. "It was very successful." Earlier this week Iraqi police commandos said they killed 85 militants in a raid on a suspected insurgent training camp near Baghdad, hailing it as a breakthrough against the insurgency. Shaalan said several suspected militants were killed in the...