The National Accountability Bureau (NAB) on Wednesday arrested Sindh Assembly Speaker Agha Siraj Durrani.
Durrani has been arrested in a case pertaining to owning assets beyond his known sources of income.
The Pakistan Peoples Party (PPP) leader was arrested from a five-star hotel in Islamabad.
Last year, NAB had initiated three separate inquiries against Durrani over alleged illegal appointments and assets beyond means.
