WASHINGTON: Students across the United States walked out of classes on Wednesday in a nationwide call for action against gun violence following the shooting rampage last month at a Florida high school.

Hundreds of students from Washington area schools gathered outside the White House chanting "Never again!" and "Enough is enough!" and holding signs reading "Protect People Not Guns."

At 10am (9pm in Thailand), students in numerous US cities held a moment of silence to honor the 14 students and three adult staff killed on Valentine's Day at Marjory Stoneman Douglas High School in Parkland, Florida.

The "National School Walkout" was intended to last for 17 minutes, one for each victim.

But it quickly became apparent that many students around the country decided not to go to classes at all and to demonstrate instead.

Brenna Levitan, a 17-year-old who goes to high school in Silver Spring, Maryland, attended the White House protest with her mother.

"We want to show Congress and politicians we are not standing by, we are not silent anymore," Levitan said. "Parkland is going to be the last school shooting."

"We need to get rid of the guns," said Levitan's mother, Danielle.

"Adding more guns, like arming teachers, doesn't make me feel safer for my kids," Danielle Levitan said of President Donald Trump's proposal to train and arm teachers.

The nationwide protest is being held one month to the day after Nikolas Cruz, a troubled 19-year-old former student at Stoneman Douglas, unleashed a hail of gunfire on his one-time classmates.

Thousands of students sat for 17 minutes outside the White House in honor of the victims of last month's high school shooting in Florida

The United States has more than 30,000 gun-related deaths annually and following the shooting Stoneman Douglas students have launched one of the most concerted movements for gun control seen in years.

Trump had momentarily signaled support for curbing access to guns, notably by raising the age for gun purchases from 18 to 21, but now stands accused of bowing to the powerful US gun lobby, the National Rifle Association (NRA).

 (Reuters video)