(CNN) Some African-American students at Marjory Stoneman Douglas High School in Florida say their voices have been ignored by the media and others in the aftermath of the deadly school shooting.

"I would say that our voices were not intentionally excluded, but they were not intentionally included," said Kai Koerber, a junior. "Now more than ever, it is time to represent the diversity of our school, and the diversity in the world."

"The Black Lives Matter movement has been addressing (gun violence) since the murder of Trayvon Martin in 2012, yet we have never seen this kind of support for our cause and we surely do not feel the lives or voices of minorities are valued as much as those of our white counterpart," student Tyah-Amoy Roberts told reporters this week, according to CNN affiliate WPEC-TV.

Nikolas Cruz, 19, a former Stoneman Douglas student, roamed the hallways of the 1200 building on campus February 14 for several minutes, targeting victims huddled in classrooms on the first and second floors, killing 17 people in one of the deadliest mass shootings in modern US history.

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