Texas Republican candidates for US Senate head to runoff as Democratic candidates await results – as it happened

This live blog is now closed. More election coverage can be found here:

• Texas Senate seat fight heads to runoff after Republicans fail to secure required votes

• Democratic rivals in close Senate primary amid Texas polling confusion

• North Carolina: Roy Cooper and Michael Whatley win primaries to set up Senate contest

North Carolina's election results will be delayed at least an hour because a rural county will be open late after workers couldn't get equipment working earlier in the day.

In Halifax county, the electronic poll books synchronized for 90 minutes and didn't use any backup measures to let people vote, according to notes from an emergency meeting held by the state's board of elections.