The protests come as student activists from Marjory Stoneman Douglas make their way to the Florida Capitol in Tallahassee, where they will meet with legislators and attend a rally for gun control on Wednesday.
Scattered school walk-outs in support of the Florida students were planned around the United States on Wednesday, according to officials and local media.
It remains unclear what will become of the building where the massacre took place. Authorities continue to occupy that building as they gather additional evidence.
Dozens of teenaged survivors of the second deadliest public school shooting in USA history marched on Florida's capital on Wednesday to ask lawmakers to ban sales of assault rifles of the sort used to kill 17 students and educators last week. Parent Jon Faber said he was "committed to making sure no child is going to be scared going into a classroom - that's what they're going to achieve".
"That's unacceptable. That's a joke", said Democratic Sen.
He described the amount of blood as though it appeared "someone took a milk jug and exploded it".
"I watched the students call their families and worry about friends nearby", she said.
House Rep. Kionne McGhee of Miami had requested that HB 219 - which would ban AR-15 rifles and other guns defined as "assault weapons" and large capacity magazines - be moved from committee to the House floor for questions, debate and a vote.
Students are also calling for anti-gun violence demonstrations in Washington and other cities March 24.
Kyle Kashuv, a 16-year-old student from Parkland, said he was pro-gun prior to the shooting.
"If you aren't with us, you're against us", said student Chris Grady. They want stricter gun laws and politicians to stop taking money from the National Rifle Association (NRA).
Florida Gov. Rick Scott, a Republican, held a roundtable on school safety Tuesday.
Young people in Florida are planning acts of civil disobedience including walkouts and sit-ins to call attention to school safety and ask lawmakers to enact gun control.
Cruz later confessed that he "began shooting students that he saw in the hallways and on school grounds", according to police reports. Cruz's lawyers said there were many warning signs that he was mentally unstable and potentially violent. That could mean raising the minimum age to purchase the weapon to 21, creating a waiting period and making it more hard for people who exhibit signs of mental illness to buy weapons even without a diagnosis. Yet he legally purchased a semi-automatic rifle.
The Senate is also considering boosting spending on mental health programs for schools and giving law-enforcement greater power to involuntarily hold someone considered a danger to themselves.