Nato chief on Tuesday said he was confident Pakistans nuclear weapons were safe, but admitted it was a matter of concern, the day after the worst assault on a Pakistani military base in two years. Anders Fogh Rasmussen was in Afghanistan on a one-day visit and met President Hamid Karzai to discuss the transition of security from Nato-led troops to Afghan security forces, which is due to begin in July. Rasmussen was asked if Nato was concerned about Pakistans nuclear weapons after it took Pakistani forces 17 hours to reclaim control of a naval air base from attackers. I feel confident that Pakistans nuclear arsenal is safe and well protected, said Rasmussen. But of course it is a matter of concern and we follow the situation closely.