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A spokesman says Monday's riot is the first time the Maryland National Guard has been called up for a civil disturbance in the state since 1968, when Baltimore erupted in violence after the assassination of Martin Luther King Jr.
Guard spokesman Lt. Charles Kohler says about 500 guardsmen are being deployed in Baltimore on Tuesday, and the force will build to about 2,000 though the day. He says that can build to 5,000, and officials also could call on Guard forces in neighboring states.
Riots broke out in the city hours after the funeral for Freddie Gray. The 25-year-old died of a spinal injury days after being taken into police custody.
Guardsmen are called up about once a year for a state of emergency such as a large snow storm or hurricane. That usually involves about 600 members - though about 2,000 were called up for President Barack Obama's inauguration.
In 1968, the state called up 6,000 Guardsmen, and 2,000 federal troops were called in to help too.
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