Hundreds of students at several South Florida high schools staged walkouts Friday morning in a massive protest against the lack of an arrest in the Trayvon Martin shooting.

Students from Miami Central, Miami Edison, Miami Norland, American Senior, William H. Turner High and Southridge High in Miami and Blanche Ely High School in Broward held walkouts.

Click here for a complete list of Miami-Dade County schools that held walkouts.

At Miami Central and Turner, students were seen pouring out of the school buildings and into the streets just after 9 a.m.

In Culter Bay, at Miami Southridge High School students formed a "TM" on a field in support of Martin.

See video, read the original story on the walkout at NBCMiami.com

Miami-Dade Police also reported a crowd of students had congregated at Southland Mall.

Miami-Dade Schools Police spokesman Sgt. Ivan Silva said there had been no incidents reported.

"Our job is to make sure the demonstrations are being run in safe and peaceful manner," Silva said.

Miami-Dade Police said they were helping with crowd control as well.

Broward County Public Schools spokeswoman Nadine Drew said the protests in that county were organized with the help of the school staff.

"For the most part they are being organized and are being supported by the school family as an outpouring show of support," she said. "I think the reaction is similar to the national reaction. I don't think our students are any different than others."

Republicans join call for Trayvon Martin inquiry

In Miami-Dade, the school district sent out a statement saying Martin's mother wanted students to honor him through reflection, not walkouts.

"While we respect the expression of emotion by our students, we ask that they remain focused on their education," said Superintendent Alberto M. Carvalho. "Our most important mission is to provide a safe learning environment for students, and so we are asking them to respect the wishes of Trayvon's mother by celebrating his memory not through walkouts, but through reflection and civic participation."

Students at Dr. Michael M. Krop Senior High School, where Martin was attending when he was killed, were going to make a banner for Martin that will be signed by students.

NBC Miami

An aerial photo shows students in Miami forming a TM on a football field in protest of the shooting of Trayvon Martin.

Also on Friday, President Barack Obama called the incident a "tragedy," saying that if he had a son, "he would look like Trayvon." Martin's family thanked the president in an email statement.

Obama: 'If I had a son, he'd look like Trayvon' 

"We'd like to thank the President and the millions of people from around the world who have shown their support for Trayvon by participating in hoodie marches, rallies or through social media. We are all working together to not only get justice for Trayvon, but also to ensure that this kindof senseless tragedy doesn't happen to another child."

On Thursday, students at Miami's Carol City High School staged a massive walkout outside the Miami Gardens school. Police said the school's principal had approved of an on-campus demonstration but that students left school grounds.

Martin, 17, was shot and killed by neighborhood watch volunteer George Zimmerman on Feb. 26 in Sanford.

Martin was visiting with his father at his father's girlfriend's home in a gated community and had gone to buy a bag of Skittles and iced tea at a nearby convenience store and was walking back when the shooting happened.

Gerardo Mora / Getty Images

Trayvon Martin's photo is seen during a protest this week in Sanford, Fla.

Though Martin was unarmed, Zimmerman told police the shooting was self-defense, and no charges have been filed in the case.

Martin's 9th grade teacher, Noemy Pascual, remembered him as a good student. He went to George T. Baker Aviation School two years ago, and she taught him three classes of Aerospace Technology.

"He was a normal student. He was well-behaved. He passed all the classes," she said.

She said he left the school because he went to live with his father in Miami Gardens.

"Really, we always feel bad because to lose a young life. It's terrible," she said. "I told my husband 'Oh, he was my student."

Thursday night, the Rev. Al Sharpton held a rally in Sanford with Martin's parents to push for Zimmerman's arrest. Hours before the rally, Sanford Police Chief Bill Lee Jr. announced he was temporarily stepping down until the completion of the Martin shooting investigation.

"We did not come here for a temporary leave of absence. We came for permanent justice," Sharpton said. "From top to bottom, we don’t need temporary relief. We need permanent change."

About a half-hour into the rally, which was attended by around 8,000 people, word came that Gov. Rick Scott had appointed a special prosecutor to oversee the investigation into Martin's death.

The governor said he appointed Angela Corey, a prosecutor for the Jacksonville area, to lead the investigation after Norman Wolfinger, the state attorney for Seminole and Brevard counties, recused himself.

Scott also appointed a task force led by Lt. Gov. Jennifer Carroll to hold hearings about the shooting and make recommendations for changing state laws and procedures.

The U.S. Justice Department and FBI are also investigating the shooting. Martin's parents, Tracy Martin and Sybrina Fulton, met with representatives from both departments before Thursday night's rally to discuss the case.

Sharpton told those gathered at the rally that "Zimmerman should have been arrested that night" and that police had probable cause.

More content from msnbc.com and NBC News:

• Students walk out in Trayvon Martin protest
• Foxhole atheists plan to rock the base at Fort Bragg
• Principal's decree: This is a 'no hugging school'
• Red Tape: Credit bureaus upsell ID theft victims
• 'Hell no, we won't glow,' nuclear protesters chant

Follow US News on msnbc.com on Twitter and Facebook