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Here's how you can help respond to the massive refugee crisis

NBC News has identified these organizations that you can give to in order to help with the massive refugee crisis captivating the world.

Hundreds of thousands of refugees from Syria and the Middle East have begun fleeing to Europe in an attempt to find safety and stability. But overwhelmed countries like Austria, Hungary, Slovakia, and Poland are all tightening their borders as the flood of migrants continues. Germany, which is on track to accept more migrants and refugees than any other European nation, imposed emergency border control measures on Sunday.

To date, the United Nations Refugee Agency has reported more than 4 million registered Syrian refugees. NBC News has identified these organizations that you can give to in order to help with the massive crisis captivating the world:

Doctors Without Borders: The international group not only offers direct medical care to refugees at the center of the crisis in Syria, but also on land and sea on key migratory routes to Europe.

International Federation of Red Cross and Red Crescent Societies: They aid refugees along the Mediterranean Sea and in Europe with clothing, food and medical services, in addition to reconnecting loved ones are separated.  

International Rescue Committee: The IRC has challenged the U.S. to take in 100,000 Syrian refugees by 2017, and it has resettled 270 of those accepted so far. In Syria, staff and volunteers have provided life-saving support to 3.3 million people, and in Europe, workers aid refugees as they arrive to the Greek Island of Lesbos.

Save the Children: Emergency responders are assisting migrant kids and their families in Greece and Serbia in addition to on the ground in Syria, where more than 1.1 million have been helped.

UNHCR: The United Nations Refugee Agency’s humanitarian workers provide emergency support to refugees on the move in Greece, Hungary, Italy, Serbia, Turkey and other nations.

UNICEF: The United Nations Children’s Fund offers aid to refugee families on Macedonia’s borders with Greece and Serbia, where it created a “child-friendly space” with educational activities and toys.

World Food Program: It’s the largest humanitarian group fighting hunger in the world, including 4 million migrants in Syria, according to NBC News.