Citizens armed with brooms and trash bags hit the streets of Baltimore Tuesday morning to clean what Monday's riots left behind.

The group swept away shattered glass and picked trash from the street as riot police stood guard with lowered shields.

"I decided to get out the bed and help clean up my community," one resident told News4's Aaron Gilchrist.

Citizens cleaning up Baltimore. Rec and Parks crews now helping. #Baltimore pic.twitter.com/pEekSBZVAz — Aaron Gilchrist (@nbcaaron) April 28, 2015

The scene was a stark contrast to Monday's unrest when rioters plunged part of Baltimore into chaos. The riots began hours after thousands mourned a man who died from a severe spinal injury he suffered in police custody.

Maryland Gov. Larry Hogan declared a state of emergency and called in the National Guard to restore order "less than 30 seconds" after the request from Baltimore Mayor Stephanie Rawlings-Blake. The Maryland State Police, backed by the Maryland National Guard, will be in charge of bringing order to the city.

"The National Guard represents the last resort in restoring order," Hogan told a news conference. "I have not made this decision lightly."

The lawyer for Freddie Gray’s family addresses the violence that erupted after his funeral Monday. Jim Handly reports.

A week-long, daily curfew was imposed beginning Tuesday from 10 p.m. to 5 a.m., the mayor said, and Baltimore public schools announced that they would be closed on Tuesday. State Offices in Baltimore city will also be closed, according the Maryland State website.

The violence, which began in West Baltimore — within a mile of where Freddie Gray was arrested and pushed into a police van earlier this month — had by the end of the day spread to East Baltimore and neighborhoods close to downtown and near the baseball stadium.

Twenty-seven people have been arrested and at least fifteen officers were injured, 6 seriously, as authorities were still struggling to quell pockets of unrest after midnight.

Derrick Ward reports from Baltimore’s Western District police station.

Gray's family condemned the violence, and his twin sister, Fredericka, called it “wrong.”

"I want y'all to get justice for my son, but don't do it like this here," Gray’s mother said at press conference Monday evening.

The attorney for Gray's family, Billy Murphy, said the family had hoped to organize a peace march later in the week.

Earlier Monday, the smell of burned rubber wafted in the air in one neighborhood where youths were looting a liquor store. Police stood still nearby as people drank looted alcohol. Glass and trash littered the streets, and other small fires were scattered about.

Jim Handly reports on the state of emergency in Baltimore, where violence and looting followed the funeral for Freddie Gray..

"Too many people have spent generations building up this city for it to be destroyed by thugs, who in a very senseless way, are trying to tear down what so many have fought for, tearing down businesses, tearing down and destroying property, things that we know will impact our community for years," said Rawlings-Blake, a lifelong resident of the city.

Officers wearing helmets and wielding shields occasionally used pepper spray to keep the rioters back. For the most part, though, they relied on line formations to keep protesters at bay.

Emergency officials were constantly thwarted as they tried to restore calm in the affected parts of the city of more than 620,000 people. Firefighters trying to put out a blaze at a CVS store were hindered by someone who sliced holes in a hose connected to a fire hydrant, spraying water all over the street and nearby buildings. A massive fire also broke out in a building that was under construction and Baltimore Mayor Stephanie Rawlings-Blake said through a spokesman that officials are investigating whether it is connected to the riots. The Mary Harvin Transformation Center, a community-based organization that supports youth and families, was engulfed in flames Monday evening.

News4’s Shomari Stone reports from Baltimore’s Mondawmin Mall, where clashes with police began Monday afternoon and where looting took place Monday evening.

Monday's riot was the latest flare-up over the mysterious death of Freddie Gray, whose fatal encounter with officers came amid the national debate over police use of force, especially when black suspects are involved. Gray was African-American. Police have declined to specify the races of the six officers involved in his arrest, all of whom have been suspended with pay while they are under investigation.

In a statement issued Monday, Attorney General Lynch said she would send Justice Department officials to the city in coming days, including Vanita Gupta, the agency's top civil rights lawyer. The FBI and Justice Department are investigating Gray's death for potential criminal civil rights violations.

Maryland Gov. Larry Hogan speaks on the protests in Baltimore following the funeral of Freddie Gray, who died in police custody after he was injured during an arrest.

Police urged parents to locate their children and bring them home. Many of those on the streets appeared to be African-American youths, wearing backpacks and khaki pants that are a part of many public school uniforms.

The riot broke out just as high school let out, and at a key city bus depot for student commuters around Mondawmin Mall, a shopping area northwest of downtown Baltimore. It shifted about a mile away later to the heart of an older shopping district and near where Gray first encountered police. Both commercial areas are in African-American neighborhoods.

Later in the day, people began looting clothing and other items from stores at the mall, which became unprotected as police moved away from the area. About three dozen officers returned, trying to arrest looters but driving many away by firing pellet guns and rubber bullets.

A man in a crowd of protesters was hit by another man, as chaos took over some of Baltimore’s streets after the funeral of Freddie Gray. Gray died in police custody after he was injured during an arrest.

Downtown Baltimore, the Inner Harbor tourist attractions and the city's baseball and football stadiums are nearly 4 miles away. While the violence had not yet reached City Hall and the Camden Yards area, the Orioles postponed Monday's home game against the Chicago White Sox for safety precautions.

A Maryland Transit Police lieutenant was attacked and injured at Penn North station, and two agency vehicles were burned, including one that became engulfed in flames on W. North Avenue near Pennsylvania Avenue.

A flier circulated on social media called for a period of violence Monday afternoon to begin at the Mondawmin Mall and move downtown toward City Hall.

"I strongly condemn the actions of the offenders who are engaged in direct attacks against innocent civilians, businesses and law enforcement officers," Hogan said earlier on Monday. "There is a significant difference between protesting and violence and those committing these acts will be prosecuted under the fullest extent of the law."

On Monday night, Maryland Congressman Elijah Cummings and about 200 others, including ministers and mostly men, marched arm-in-arm through a neighborhood littered with broken glass, flattened aluminum cans and other debris, in an attempt to help calm the violent outbursts. As they got close to a line of police officers, the marchers went down on their knees.

After the ministers got back on their feet, they walked until they were face-to-face with the police officers in a tight formation and wearing riot gear.

Derrick Ward reports from Baltimore’s Western District police station.

Many who had never met Gray gathered earlier in the day in a Baltimore church to bid him farewell and press for more accountability among law enforcement.

The 2,500-capacity New Shiloh Baptist church was filled with mourners. But even the funeral could not ease mounting tensions.

Police said in a news release sent while the funeral was underway that the department had received a "credible threat" that three notoriously violent gangs are now working together to "take out" law enforcement officers.

Jim Handly reports on the state of emergency in Baltimore, where violence and looting followed the funeral for Freddie Gray..

A small group of mourners started lining up about two hours ahead of Monday's funeral. Placed atop Gray's body was a white pillow with a screened picture of him. A projector aimed at two screens on the walls showed the words "Black Lives Matter & All Lives Matter."

The dignitaries who attended Gray's funeral included long-time activist Dick Gregory, former Maryland representative and NAACP leader Kweisi Mfume, and current Maryland Rep. John Sarbanes.

Maryland Gov. Larry Hogan speaks on the protests in Baltimore following the funeral of Freddie Gray, who died in police custody after he was injured during an arrest.

The casket was rolled out of the church with his family following behind. Within minutes, the entire church was empty, leaving the musicians to play a rousing processional.

As people left, there was an image of Gray projected on the screens flanking the altar. It showed him wearing a striped polo shirt, baseball cap, pants and sneakers. The front of the program read, "Loving Memory, Freddie Carlos Gray Jr."

