The US has captured Venezuela's President Nicolas Maduro and his wife and launched "large-scale" strikes against the country, Donald Trump says.

He says Maduro has been flown out of the country, though details remain scarce.

Venezuela's government demands "immediate proof of life" for Maduro and his wife.

Earlier, Venezuela announced a state of national emergency and said it rejects and denounces "military aggression".

"My heart was pumping and legs were shaking," an eyewitness in Caracas tells the BBC as explosions rocked the city.

Footage shows huge plumes of smoke as fires rage.

Explosions have been heard and smoke is seen rising above the Venezuelan capital Caracas.

There were numerous near-simultaneous reports of explosions in several places in Caracas, including military installations.

La Carlota, a military airfield in the centre of the city, and the main military base of Fuerte Tiuna were described by eyewitnesses as having been affected, with video circulating of apparent explosions at both.

Several of the surrounding communities are without power. There are unconfirmed reports of planes flying over the city.

The developments come at a moment of heightened tension between the US and Venezuela as Washington keeps up its military strikes on speedboats in the Caribbean, allegedly carrying drugs.

The US says the Venezuelan President Nicolas Maduro was illegitimately elected and is personally involved in drug-smuggling through the country.

The Venezuelan Government say recent actions by Washington – which include the confiscation of sanctioned oil tankers – are part of an effort to force the removal of President Maduro from power and control Venezuela’s oil reserves.

On Thursday, Venezuelan President Nicolás Maduro said he was open to talks with the US on drug trafficking and oil "wherever and whenever they want".

In the interview with Venezuelan state TV, Maduro also avoided responding to a statement by US President Donald Trump that the US had hit a docking facility in Venezuela - marking the first such attack inside the country reportedly carried out by the CIA.

A few days before Maduro's interview, Trump said the US carried out a strike on a "dock area" linked to alleged Venezuelan drug boats, adding there had been a "major explosion" where "they load the boats up with drugs".

It follows weeks of Trump's ramped up pressure on Maduro, who he accuses of "emptying his prisons and insane asylums" and "forcing" its inmates to migrate to the US - along with using oil money to fund drug-related crime.

Since September, the US has launched 30 strikes on what it says are drug-smuggling boats, targeting vessels in the Pacific and the Caribbean.

More than 110 people have been killed since the US carried out its first attack on a boat in international waters on 2 September.

How did we get here?

• First, there were airstrikes on speed boats allegedly carrying drugs through Venezuelan waters
• This has extended into the eastern Caribbean, Pacific and elsewhere – 110 have been killed so far
• US forces have confiscated two sanctioned oil tankers, and a third is being pursued
• Over Christmas, Trump made reference to the first land strike.
• We have very few details about that, although the BBC is looking into witness statements and it is believed to have taken place in Zulia, which is an oil-rich state

So, what are the potential consequences?

We know so far that there’s been a special communique – or statement – from the Venezuelan government, which repudiates actions which it blames immediately on the US government.

It also calls the government’s social supporters to action across the length and breadth of the country – that’s militias and grass roots organisations.

To an extent, Maduro is doing what one would expect – appealing to his socialist base. There’s very little he can actually do at this point, because we're waiting for more details to emerge.

But it does appear that this is a significant ramping up of a situation that has been building for months.