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Oprah, other 'Selma' stars march as MLK holiday opens; some reflecting on killings by police

  • Oprah Winfrey locks arms with David Oyelowo, left, who portrays Martin Luther King Jr. in the movie "Selma," Ava DuVernay, the director of "Selma" and rapper Common, far left, as they march to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. (AP Photo/Brynn Anderson)

    Oprah Winfrey locks arms with David Oyelowo, left, who portrays Martin Luther King Jr. in the movie "Selma," Ava DuVernay, the director of "Selma" and rapper Common, far left, as they march to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. (AP Photo/Brynn Anderson)  (The Associated Press)

  • Oprah Winfrey locks arms with David Oyelowo, who portrays Martin Luther King Jr. in the movie "Selma" as they pray just before they march to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. (AP Photo/Brynn Anderson)

    Oprah Winfrey locks arms with David Oyelowo, who portrays Martin Luther King Jr. in the movie "Selma" as they pray just before they march to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. (AP Photo/Brynn Anderson)  (The Associated Press)

  • Marchers hold up a "March On" sign as they make their way towards the Edmund Pettus Bridge the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. Several clebraties such as Oprah Winfrey, John Legend, Common, and David Oyelowo lock arms and march to promote the movie "Selma."(AP Photo/Brynn Anderson)

    Marchers hold up a "March On" sign as they make their way towards the Edmund Pettus Bridge the Edmund Pettus Bridge in honor of Martin Luther King Jr., Sunday, Jan. 18, 2015, in Selma, Ala. Several clebraties such as Oprah Winfrey, John Legend, Common, and David Oyelowo lock arms and march to promote the movie "Selma."(AP Photo/Brynn Anderson)  (The Associated Press)

Oprah Winfrey and fellow actors from the movie "Selma" marched with hundreds in a tribute to Martin Luther King Jr., one of many events around the nation ushering in Monday's federal holiday for the slain civil rights leader.

Remembrances of the King legacy come amid somber reflection by many on incidents in which unarmed black men were killed by police in recent months, spurring protests and heightening tensions in the U.S. In Ferguson, Mo., where one fatal shooting caused weeks of violent protests, leaders urged reforms to the criminal justice system in the name of equality.

The King holiday, meanwhile, was being met with activities nationwide, including plans for a wreath-laying in Maryland, a tribute breakfast in Boston and volunteer service activities by churches and community groups in Illinois.