Saudi Arabia's King Salman pulls out of G20 summit amid Qatar blockade

King Salman of Saudi Arabia has pulled out of this week's G20 summit in Hamburg, the German government said on Monday, as the kingdom's diplomatic standoff with Qatar continues.

"The government has received official notification that King Salman will not travel to the G20 summit," a spokesman told AFP.

The 81-year-old monarch will send Finance Minister Mohammed al-Jadaan in his place, the German news agency DPA said separately.

The monarch was due to join the meeting of major industrialised and emerging economies on Friday and Saturday.

The Saudi delegation had rented out Hamburg's luxury Vier Jahreszeiten (Four Seasons) hotel in its entirety for the king and his delegation, German media reports claimed.

Saudi Arabia and its allies the United Arab Emirates, Bahrain and Egypt have engaged in a bitter row with Qatar, severing air, sea and ground links and cutting off vital routes for imports including food.

They accuse Doha of supporting Islamic extremism and of being too close to their regional rival Iran, which Qatar has strongly denied.

They are demanding that Doha end support for the Muslim Brotherhood, close broadcaster Al-Jazeera, downgrade diplomatic ties with Iran and shut down a Turkish military base in the emirate.

On Monday, Qatar handed its official response to the 13 demands to the emir of Kuwait, which is acting as a mediator, a Gulf official told AFP.

It was delivered hours after the four nations had accepted a call by Kuwait's Emir Sheikh Sabah al-Ahmad Al-Sabah to extend the 10-day deadline for another 48 hours.

German Foreign Minister Sigmar Gabriel on Monday travelled to the region, where he was to meet his Saudi counterpart Adel al-Jubeir and visit the UAE before heading to Qatar and Kuwait on Tuesday.

Meanwhile, US President Donald Trump spoke separately on Sunday with leaders of Saudi Arabia, Qatar, and Abu Dhabi to discuss his "concerns about the ongoing dispute".

Another reported no-show at the Group of 20 meeting will be Brazilian President Michel Temer, who is under pressure at home in a bribery case.