A former Brazilian state governor, Eduardo Campos, confirms he will run in October's presidential election with the environmental campaigner, Marina Silva, as his vice-presidential candidate.

Air pollution in China and other Asian countries is having far-reaching impacts on weather patterns across the Northern Hemisphere, a study suggests.

Canada cites human rights concerns in its decision to suspend funding to the Commonwealth while the chair of the secretariat is occupied by Sri Lanka.

The cross-examination of South African Olympic athlete Oscar Pistorius is due to resume for a fifth day at his trial in Pretoria.

Memorial ceremonies are due to be held in the US city of Boston to mark the anniversary of the deadly bombing at last year's marathon.

A robotic submarine sent to search for the missing Malaysia Airlines plane has had its first mission cut short, as it exceeds its operating depth.

US President Barack Obama calls on Russian counterpart Vladimir Putin to use his influence to make separatists in eastern Ukraine stand down.

South Korea promises to overhaul its intelligence agency after three officials are charged with fabricating evidence in a North Korea spying case.