ISLAMABAD: A US aid package has put the Pakistani Government at odds with its military and triggered an unexpected political crisis.

The Kerry-Lugar bill passed the US Congress last week, promising to triple annual spending on aid for Pakistan's poor to $US1.5 billion ($1.7 billion).

But conditions apply, and the military has taken the unusual step of making public its trenchant opposition to those conditions public.

On Wednesday night it issued a statement expressing ''serious concern regarding clauses impacting on national security'' and said ''formal input is being provided to the Government'', without further explanation.

The military chief, General Ashfaq Parvez Kayani, is understood to have described the bill at a meeting of top military leaders on Wednesday as ''intrusive''.