U.S. First Lady Melania Trump was stuck inside a hotel the entire day in Hamburg on Friday due to anti-G-20 protests.
Melania Trump and other spouses of world leaders were to attend a series of events in the northern German city, which had to be severely curtailed because of the demonstrations.
"The Hamburg Police could not give us clearance to leave (the residence)," Trump's spokeswoman Stephanie Grisham said.
"First lady Melania Trump is unable to participate in events with G20 spouses due to protests," her spokesperson said.
Melania Trump and spouses of other world leaders will now be given presentations by climate scientists at a Hamburg hotel instead of taking them to visit a climate centre.
Earlier, huge sit-in demonstrations were held by protestors as G-20 summit kicked off in the city.
The protestors blocked a road in Hamburg on Friday morning. The police tried to disperse the protestors peacefully, but then deployed water cannons to clear the road.
45 people have been detained and 159 police officers wounded in clashes, according to the police, as cited by the German media.
The Berlin and Baden-Württemberg police units were deployed in addition to the 20,000 or so already providing security during the G20 summit, Russia Today reported.