Today in Pictures: March 12

Presidential candidate Senator Bernie Sanders (D-VT) greets Rev. Jesse Jackson following an interview at Operation Rainbow Push in Chicago, Ill. on March 12, 2016. Illinois voters go to the polls on March 15 for their state's primary.

Secret Service agents surround Donald Trump during a disturbance as he speaks at Dayton International Airport in Dayton, Ohio on March 12, 2016.

President Barack Obama tries on a supporter's cowboy hat after speaking at a Democratic National Committee (DNC) event at Gilley's Club in Dallas, Texas in March 12, 2016. 

Palestinians mourn over the body of Israa Abu Khussa, who was 6, during her funeral on March 12, 2016 in Beit Lahiya in the north of the Gaza strip. She was wounded in an Israeli airstrike on the Gaza strip on March 12 and died of her injuries, according to Palestinian medical sources.

105-year-old Polish man Stanislaw Kowalski competes in the men's 60m M80+ category run at the Indoor Track and Field Veterans Championships in Torun, Poland on March 12. He will turn 106 on April 14 this year.

Children lie on railway track as they hold banners reading "Open the border" during a demonstration on March 12, near the makeshift camp close to the Greek village of Idomeni by the Greek-Macedonian border where thousands of refugees and migrants are trapped by the Balkan border blockade.

Photos: Migrants Struggle to Survive at Greek-Macedonian Border

Taiwanese holding placards take part in the annual anti-nuclear protest during a downpour in Taipei, Taiwan on March 12, 2016. The protesters demand the government to shut the three nuclear power plants in operation and halt the construction of the fourth one.

Young victims exposed to a chemical attack wait for treatment at a hospital in Taza, 10 miles south of Kirkuk in northern Iraq, on March 11, 2016. 

The Islamic State group launched two chemical attacks near Kirkuk, killing a three-year-old girl, wounding some 600 people and causing hundreds more to flee, according to Iraqi officials. 

South Korean veterinarian Dr. Lee Mikyong who rescued Chi Chi, the Golden Retriever after she was tortured and left for dead in a trash bag in South Korea, applies bandages to her amputated legs after her arrival for adoption in Los Angeles, Calif. on March 11, 2016. Chi Chi, who had all four legs amputated after irreparable damage from being bound and hung upside in a dog meat market, will go to a new home in Arizona after being brought to the US by the Animal Rescue, Media & Education rescue group.

South Korean, with blue headbands, and U.S. Marines take positions as amphibious assault vehicles of the South Korean Marine Corps fire smoke bombs during a U.S.-South Korea joint landing operation drill in Pohang, South Korea on March 12.

The Week in Pictures: March 3 - 10