It was on May 13, 1985 that Philadelphia police dropped explosives on the Osage Avenue home that was occupied by members of the radical group named MOVE.
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In total, 11 people were killed, including five children. Two city blocks were destroyed along with 61 residential homes.
To mark the solemn anniversary, a day of remembrance was held at Cobbs Creek Parkway and Osage Avenue at the site of the historical marker.
Mike Africa Junior was a child when that bombing unfolded.
He lost his great uncle, John Africa, and his cousin in the attack.
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Africa said the events of recent years show that there is still a lot of work to be done.
"This thing we call revolution has many phases and many steps, but none of it can work without unity," he said.
Africa recently bought a home that was built in the same place where his aunt's house was destroyed.
He says he intends to convert the home into a place where people can learn about what happened and remember those who died.