Officials said the man had killed himself with a bomb after trying to enter the Supreme Court, prompting security concerns ahead of the global leaders meetingA man killed himself with a bomb outside Brazil’s supreme court after trying to enter the building on Wednesday, officials have said, stirring security concerns before the country hosts global leaders from the Group of 20 major economies.The blasts come five days before the G20 heads of state meet in Rio de Janeiro, followed by a state visit to the capital Brasília by Chinese President Xi Jinping.In the UK and Ireland, Samaritans can be contacted