MELANIA Trump was unable to leave a building in Germany following the chaotic protests against the G20 summit.

German news agency DPA reported that the wife of Donald Trump was stuck in her residence in Hamburg and could not join a trip with fellow spouses.

2 Melania Trump, pictured yesterday, was unable to leave her accommodation in Hamburg amid chaotic protests against the G20 summit Credit: EPA

2 A number of protests have been held in the German city with activists pictured torching cars and clashing with police Credit: Reuters

Stephanie Grisham, Melania's spokeswoman, said Hamburg police had not cleared the first lady to leave the government guest house where she and President Trump spent the night because of the violent demonstrations.

Ms Grisham said: "The Hamburg police could not give us clearance to leave (the residence)."

Instead of a visit to a climate centre, the spouses will be treated to presentations by climate scientists at a Hamburg hotel.

Melania tweeted that she was thinking of those who were hurt during protests that began Thursday.

She said she hoped everyone stays safe.

A number of protests have been held in the German city with activists pictured torching cars and clashing with police.

A police spokesman said the number of police officers injured so far in running battles with demonstrators late Thursday and overnight has risen to 159 with 45 arrests.

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One had to be taken to a hospital with an eye injury after a firework exploded in front of him.

The city has boosted its police with reinforcements from around the country and has 20,000 officers on hand to patrol Hamburg’s streets, skies and waterways.

On Friday, water cannons were fired at protesters who made a blockade ahead of the summit.

Police said the incident happened on the banks of the Outer Alster lake, some distance from the trade fair grounds in Hamburg on Friday morning.

On Thursday, riot police fired water cannons and pepper spray at far-left activists after cops were pelted with rocks and flares during the "Welcome to Hell" rally in Hamburg.

Around 12,000 took to the streets to protest against globalisation as world leaders including Donald Trump and Xi Jinping arrived in the city ahead of the summit.

Cops clashed with black-hooded protesters after they attacked a police vehicle with bottles and bricks, breaking its window.

Violence broke out near the start of the demonstration at a riverside plaza used for Hamburg’s weekly fish market.

Marchers chanted and waved banners during a stand-off that lasted around 40 minutes.

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