US National Intelligence chief James Clapper has said authorities did not want to attribute blame of Democratic National Convention (DNC) email leak yet, reports Reuters. His statement comes in the wake of allegations by US officials that evidence appeared to implicate Russia.

"We don’t know enough to ascribe motivation," said Clapper at the Aspen Security Forum. "Was this just to stir up trouble, or was this ultimately to try to influence an election? That’s a serious proposition." He did, however, indicate it was likely the work of a nation-state and not independent groups.

The emails leaked had caused a furor over DNC’s preference for Hillary Clinton over Bernie Sanders as presidential candidate.

Clapper also voiced concerns over Republican Donald Trump’s rhetoric on US overseas alliances, saying it was a cause for worry to the nation’s foreign partners.

Read details on Reuters.