Martin Luther King III, right, and Rev. Al Sharpton, second from right, join in a march commemorating the anniversary of the assassination of Rev. Martin Luther King Jr. Wednesday, April 4, 2018, in Memphis, Tenn. Martin Luther King Jr. was assassinated April 4, 1968, while in Memphis supporting striking sanitation workers. (AP Photo/Mark Humphrey)

Martin Luther King III, right, and Rev. Al Sharpton, second from right, join in a march commemorating the anniversary of the assassination of Rev. Martin Luther King Jr. Wednesday, April 4, 2018, in Memphis, Tenn. Martin Luther King Jr. was assassinated April 4, 1968, while in Memphis supporting striking sanitation workers. (AP Photo/Mark Humphrey)

MEMPHIS, Tenn. (AP) — With thoughts on the past and eyes to the future, thousands marched and sang civil rights songs Wednesday to honor the Rev. Martin Luther King Jr., the “apostle of nonviolence” silenced by an assassin 50 years ago.

At events ranging from a jubilant concert to a solemn wreath-laying, admirers across the country took time to both reflect on King’s legacy and discuss how his example can apply to racial and economic divides still plaguing society.

Among the largest gatherings was a march through the Mississippi River city where the civil rights leader was shot dead on a motel balcony in 1968. Memphis police estimated a crowd of about 10,000.

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The Rev. James Lawson, who invited King to Memphis 50 years ago to assist with a strike by underpaid sanitation workers, helped lead the march and said more progress is needed toward King’s goal of equality for all.

“I’m still anxious and frustrated,” said Lawson, his black hair turned gray. “The task is unfinished.”

Speaking in King’s hometown of Atlanta, the Rev. Bernice King recalled her father as a great orator whose message of peaceful protest was still vital decades later.

“We decided to start this day remembering the apostle of nonviolence,” she said during a ceremony to award a prize named for her father.

As painful as losing her father was, she said she wouldn’t change history.

“Actually, I’m glad that everything happened the way that it happened because I can’t imagine the world that we live in without the contributions of Martin Luther King Jr. and Coretta Scott King and the sacrifice that they made,” she said.

Before the Memphis march, the rapper Common and pop singer Sheila E had the crowd dancing and bobbing their heads. Then, as the march began, people locked arms or held signs as they chanted and sang songs such as “We Shall Overcome.”

“We know what he worked hard for, we know what he died for, so we just want to keep the dream going,” said Dixie Spencer, who came to the march from nearby Hardeman County, where she’s an NAACP leader. “We just want to make sure that we don’t lose the gains that we have made.”

Martin Luther King III addressed marchers at the end of their route, focusing on the triple evils of poverty, racism and war. “There’s something wrong in our nation where a minimum of 48 million people are living in poverty. That’s unacceptable. We must do better. America should be embarrassed about having people living in poverty.”

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In the evening, ringing bells marked the moment King was gunned down at age 39. Members of King’s family pulled a rope together to ring a bell 39 times at the pool surrounding the Atlanta crypt of King and his wife. The family then laid a wreath of multicolored flowers in front of the crypt. The crowd gathered outside Memphis’ old Lorraine Motel fell silent as the bell began to ring there. A red and white wreath was placed on the balcony where King had been standing when he was shot.

Small-time criminal James Earl Ray pleaded guilty to the killing and quickly recanted, claiming he was set up. The conviction stood, and Ray died in prison in 1998.

Marking the anniversary of the assassination, President Donald Trump issued a proclamation in honor of the slain leader, saying: “In remembrance of his profound and inspirational virtues, we look to do as Dr. King did while this world was privileged enough to still have him.”

The president has been the target of veiled criticism by some speakers at King commemorations in recent days as they complained of fraught race relations and other divisions since he was elected.

Observances marking King’s death were planned coast-to-coast. In New York, the Dance Theatre of Harlem planned an evening performance in his honor. Another march was scheduled in Yakima, Washington.

In Montgomery, Alabama, where King first gained notice leading a boycott against segregated city buses, a commemorative event brought a symbol of transformation: The daughter of King’s one-time nemesis, segregationist Gov. George C. Wallace, paid tribute to the slain civil rights leader.

Shirley Mason was a young woman living in Detroit when King was killed. Now 70, she said she came to Memphis not only to honor King’s legacy but to call for his work to be continued.

″(King) went through the struggle and gave up his life,” she said. “Why not get out ourselves and do some sacrificing?”

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Brumback reported from Atlanta.

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For AP’s complete coverage on the 50th anniversary of Martin Luther King Jr.’s assassination, go to https://apnews.com/tag/MartinLutherKingJr