 While subsequently released files show that 'Macmillan's cuts were few and covered up few technical details', and that even the full report found no danger to public health, but later official estimates acknowledged that the release of polonium-210 may have led directly to 25 to 50 deaths, and anti-nuclear groups linked it to 1,000 fatal cancers.On 25 March 1957, Macmillan acceded to Eisenhower's request to base 60 Thor IRBMs in England under joint control to replace the nuclear bombers of the Strategic Air Command, which had been stationed under joint control since 1948 and were approaching obsolescence.Partly as a consequence of this favour, in late October 1957 the US McMahon Act was eased to facilitate nuclear co-operation between the two governments, initially with a view to producing cleaner weapons and reducing the need for duplicate testing.