Labour's Richard McKenzie, the Liberal Democrats' Stephen Kearney and the Green Party's Mark Stevenson have already been selected to fight a by-election.

BBC: Stanley Johnson

Associated Press writers Jim Kuhnhenn and Alberto Arce in San Jose, Costa Rica, and Mark Stevenson in Mexico City contributed to this report.

NPR: Obama: US, Latin America Must Strengthen Economies

An England quartet of Andy Baddeley, Ricky Stevenson, Nick McCormick and Mark Draper smashed the 30-year-old UK 4x1, 500m relay record in finishing fifth in 14:54.57 to erase the previous mark by two seconds.

BBC: Powell beats Gay in Brussels 100m