Sunday in Pictures: Campaigning in Iowa and More

See today's 10 best news photos.

Campaign volunteers listen as Democratic presidential candidate Sen. Bernie Sanders speaks during a campaign event at Five Sullivan Brothers Convention in Waterloo, Iowa. Alex Wong / Getty Images
A competitor emerges from the water during the Tough Guy Challenge at South Perton Farm in Telford, England. Dan Mullan / Getty Images
A migrant boy holds blankets as he disembarked from the passenger ferry Blue Star arriving from the Greek island of Lesbos at the port of Piraeus in Athens. ANGELOS TZORTZINIS / AFP - Getty Images
Israeli soldiers react as they secure the scene of a reported Palestinian shooting attack at a checkpoint near the Beit El settlement, close to West Bank city of Ramallah. A Palestinian opened fire at a checkpoint near the Jewish settlement in the West Bank, wounding three Israelis before being shot dead. ABBAS MOMANI / AFP - Getty Images
Alice Vitoria Gomes Bezerra, 3-months-old, who has microcephaly, is held by her mother Nadja Cristina Gomes Bezerra in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. Mario Tama / Getty Images
Republican presidential candidate Jeb Bush speaks at a campaign event at his local field office in Hiawatha, Iowa. The Democratic and Republican Iowa Caucuses, the first step in nominating a presidential candidate from each party, will take place on February 1. Brendan Hoffman / Getty Images
U.S. Republican presidential candidate Donald Trump is mobbed by supporters after a campaign rally in Council Bluffs, Iowa. SCOTT MORGAN / Reuters
U.S. Democratic presidential candidate Hillary Clinton is greeted by a young girl as she arrives to speak at a campaign rally at Abraham Lincoln High School in Council Bluffs. BRIAN SNYDER / Reuters
Syrian security forces and residents gather at the site of suicide bombings in the area of a revered Shiite shrine in the town of Sayyida Zeinab, on the outskirts of the capital Damascus. LOUAI BESHARA / AFP - Getty Images
A car tows a snowboarder along the frozen surface of the Yenisei River in Taiga district, with the air temperature at about minus 13 degrees, outside Krasnoyarsk, Siberia, Russia. ILYA NAYMUSHIN / Reuters