''I am deeply shocked by news of the latest attack in Rawalpindi which has claimed the life of Benazir Bhutto and killed at least 15 other people. My thoughts and sincere condolences go to Ms Bhutto's family at this terrible time, as well as to the families of all those who lost their lives in this senseless attack,'' he said in a statement.
''Benazir Bhutto showed in her words and actions a deep commitment to her country. She knew the risks of her return to campaign but was convinced that her country needed her,'' he said.
Mr Miliband said ''This is a time for restraint but also unity.
All those committed to a stable future for Pakistan will condemn without qualification all violence perpetrated against innocent people. In targeting Benazir Bhutto extremist groups have in their sights all those committed to democratic processes in Pakistan. They cannot and must not succeed.'' ''The large Pakistani community in the United Kingdom will be gravely concerned about these latest developments. Let me reassure them that the UK government will continue to work with all those who want to build a peaceful and democratic Pakistan,'' he added.