Britain and the US are to establish a new joint group to counter violent extremism, Barack Obama and David Cameron have announced.

Speaking after talks with the president at the White House, the Prime Minister said the US and UK are united in their drive to fight "poisonous and fanatical ideology".

The talks came in the wake of the Paris attacks which left 17 people dead.

Mr Cameron said the new group will examine additional ways to identify and counter terror threats in both countries.

The US and UK will also share intelligence in an effort to learn from one another's experiences.

"Britain and America both face threats to our national security from people who hate what our countries stand for and are determined to do us harm," Mr Cameron told a joint press conference with Mr Obama.

"In recent weeks, we have seen appalling attacks in Paris, in Peshawar, in Nigeria. The world is sickened by this terrorism.

"So we will not be standing alone in this fight. We know what we are up against. And we know how we will win.

"We face a poisonous and fanatical ideology that wants to pervert one of the world's major religions - Islam - and create conflict, terror and death. With our allies we will confront it wherever it appears.

"But, most important of all, we must also fight this poisonous ideology, starting at home."

Mr Cameron also announced that Britain will provide additional intelligence and surveillance assets to Iraqi forces fighting Islamic State.