Democratic presidential candidate Hillary Clinton has declared victory in Kentucky as she tightens her grip on the presidential nomination.

With most of the votes counted in Kentucky, Hillary Clinton has been declared the unofficial winner by one state official.

In the night's other primary contest in Oregon, rival Bernie Sanders is ahead.

Front-runner Clinton is almost certain to secure the nomination in July, with a significant delegate lead.

Clinton has won 94% of delegates needed to win the nomination and has a total of 25 states to Mr Sanders' 19.

Alison Lundergan Grimes, chairwoman of the Kentucky State Board of Elections, told CNN that unofficial results confirmed that Clinton would narrowly win the state's primary contest.

The polls closed in Oregon at 2300 EST (0300 GMT) but early indications show Sanders well ahead.

(BBC)