London, England (CNN) -- Two U.S. senators from New Jersey intensified their calls for the British and Scottish governments -- and oil giant BP -- to provide information surrounding the circumstances of the convicted Lockerbie bomber's release a year ago. The British government urged Libya on Friday not to celebrate the anniversary of the convicted bomber's release, saying it would be "offensive and deeply insensitive" to the families of the 270 people killed in the 1988 bombing of a Pan Am flight over Scotland. Also Friday, the Obama administration again blasted the decision by Scotland to release Abdelbeset Ali Mohmed al Megrahi from prison exactly a year ago on compassionate grounds due to a diagnosis of terminal cancer.
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NEW: Clinton, Brennan blast decision to release al Megrahi
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Two U.S. senators call for the British and Scottish governments and BP to furnish information
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UK: Celebrating bomber's release would be "offensive and deeply insensitive"
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Al Megrahi was released a year ago on humanitarian grounds
U.S. senators also have repeatedly voiced suspicions that @placeholder released al Megrahi as part of a deal allowing BP to drill off the Libyan coast.