Theresa May will call on G20 leaders to choke off funding for terrorists as she makes tackling the growing threat her top priority at the two-day summit in Hamburg.

In the wake of a wave of terror attacks in Britain, the prime minister will warn IS is exploiting loopholes to build up finances.

Banks and financial technology companies must be on alert to find and stop large and small cash transfers that fund terror, the PM will say.

She will also call for work to be carried out with the private sector to develop new ways to track suspicious transactions.

North Korea will play a "significant part" in the discussions, with China facing intense to rein in its ally after Pyongyang's latest missile launch.

Mrs May is also set to tackle Donald Trump on climate change after the US President controversially withdrew from the Paris Agreement deal.

Mrs May will also push to:

Police are on high alert as protesters plan major demonstrations over the attendance of controversial premiers such as Mr Trump, Russia's Vladimir Putin and Turkey's Recep Tayyip Erdogan.

Two days before the summit was due to start demonstrators descended on the German city for their 'Welcome to hell' protest.

Things started peacefully but riot police used pepper spray and water cannon as some of the crowd became violent as darkness fell.

Seventy-six officers were injured in the clashes on Thursday night including three who were taken to hospital.

The pilots of a police helicopter sustained eye injuries when lasers were pointed at them, police said.

Mrs May flew into Germany ahead of the summit with husband Philip on his first official overseas visit.

He will join other spouses, such as Melania Trump, in a separate programme of events.

But will accompany the Prime Minister to a concert at the Elbphilharmonie concert hall on Friday night where Beethoven's Symphony No. 9 will be played, which includes the melody for the EU's anthem.

Chancellor Philip Hammond will also be attending the summit on Friday for a series of meetings with other finance ministers.

Labour leader Jeremy Corbyn said: "If Theresa May is serious about cutting off financial and ideological support for terrorism, she should publish the suppressed report on foreign funding of UK-based extremism and have difficult conversations with Saudi Arabia, not hug Saudi and allied Gulf States even closer."