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Swedish climate activist Greta Thunberg has said her calls for action on the environment have been "ignored" by leaders, as she arrived in Madrid on Friday.

She is in the Spanish capital to attend COP25 - the United Nations' climate talks, where she joined other young activists on a protest.

Miss Thunberg arrived in the Spanish capital after taking a ten-hour train from Lisbon, after her three-week transatlantic journey from the US.

Speaking to reporters as she arrived, Miss Thunberg said she hoped that the COP25 conference would lead to "something concrete" and "increase awareness among people in general".

"We have been striking now for over a year, and still basically nothing has happened," she said.

"The climate crisis is still being ignored by those in power."

She added: "Some people want everything to continue like now, they are afraid of the change that we, the youth, are bringing.

"They try so desperately to silence us."

She also gave a surprise appearance at the conference venue on Friday afternoon, where she joined other activists at a sit-in, while singing "power for the people".

Later on Friday, Miss Thunberg attended a huge march in the city, thought to be attended by more than 15,000 people, according to Spanish officials.

She was followed on the march by masses of cameras and fans, who were trying to get a glimpse of the teenage climate sensation - but she had to stop shortly after she began on police advice.

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She had been due to give a speech at the end of the protest.

During the march, activists unfurled a banner that said "Just 8 years till 1.5 degrees C. HOW DARE YOU?" - a reference to the speech Miss Thunberg delivered earlier in the year.

The United Nations-backed COP25 climate talks will take place until the 13 December and involve delegates from across the world, in an effort to find a solution to the climate crisis.