SANAA, June 20 (Xinhua) -- Yemeni protesters take part in a rally outside the UN Office in Sanaa, Yemen, on June 19, 2019. The head of the World Food Programme (WFP) David Beasley on Monday lashed out at Houthi rebels in Yemen for misappropriating aid supplies. David Beasley warned that the WFP will have to begin a phased suspension of food assistance, most likely toward the end of the week unless it receives the necessary assurances from the Houthis.

LONDON, June 20 (Xinhua) -- British Prime Minister Theresa May (front) attends the Prime Ministers Questions at the House of Commons in London, Britain, on June 19, 2019.

WASHINGTON , June 20 (Xinhua) -- U.S. Federal Reserve Chairman Jerome Powell speaks at a press conference in Washington D.C., the United States, on June 19, 2019. The U.S. Federal Reserve on Wednesday left interest rates unchanged as officials weighed mixed signals on the health of the U.S. economy and the impact of trade tensions.

UNITED NATIONS, June 20 (Xinhua) -- Stephane Dujarric, spokesperson for United Nations Secretary-General Antonio Guterres, attends a press briefing at the UN headquarters in New York, June 19, 2019. Stephane Dujarric said on Wednesday that the power and authority to launch international follow-up criminal investigations on Saudi journalist Jamal Khashoggis death lie with UN member states.

HOMS (SYRIA), June 20 (Xinhua) -- Syrian refugees arrive at the Jlaighem crossing in the eastern countryside of Homs Province, Syria, on June 19, 2019. Batches of Syrian refugees returned from the Rukban camp in southern Syria on Wednesday, according to the state news agency SANA.

WASHINGTON, June 20 (Xinhua) -- Retired airline captain Chesley Sullenberger (C) testifies during the hearing on Status of the Boeing 737 MAX: Stakeholder Perspectives on Capitol Hill in Washington D.C., the United States, on June 19, 2019.

UNITED NATIONS, June 20 (Xinhua) -- Ninette Kelley (R), Director of the New York Office of the United Nations High Commissioner for Refugees (UNHCR), briefs journalists at the UN headquarters in New York, June 19, 2019. Almost 70.8 million people were forcibly displaced in 2018, with a 2.3-million increase compared to the previous year, according to the annual Global Trends report released ahead of the World Refugee Day by the United Nations Refugee Agency.

SAO PAULO, June 20 (Xinhua) -- Visitors take photos at the Sweet Art Museum installation art exhibition in Sao Paulo, Brazil, June 19, 2019. The exhibition will open to the public on June 20 and will last to late August.