Teenagers have staged a “lie-in” outside the White House as students across the country mobilise to protest the lack of gun control in the US in the wake of one of the worst school shootings in the country’s history.

A group, known as Teens for Gun Reform, had 17 members lie down outside the White House to symbolise the number of people who lost their lives last week at Marjory Stoneman Douglas High School in Florida. Protests in the state and beyond have criticised President Donald Trump’s tepid response to the shooting.

Dozens were involved in the protest, chanting slogans such as, “We want safe schools!” and carrying signs, including one which said, “Am I next?”

“We have organised this protest in solidarity with all of those who were affected by the horrific school shooting in Florida last Wednesday,“ the organisation said in a statement. ”We call on President Trump and leaders from both parties to finally act in the interest of America’s youth and end these tragic mass shootings!“

Ella Fesler, a 16-year-old high school student in Alexandria, Virginia told the Associated Press: “It’s really important to express our anger and the importance of finally trying to make a change and having gun control in America.”

During the demonstration, Mr Trump was at his Florida golf club, some 40 miles from the site of the school shooting. Throughout his presidential campaign, Mr Trump tied himself to the National Rifle Association (NRA), one of the most powerful gun-rights organisations.

Florida shooting – in pictures Show all 10 1 /10 Florida shooting – in pictures Florida shooting – in pictures Police arrest a suspect in connection with the shooting at the Marjory Stoneman Douglas High School in Parkland, Florida Reuters Florida shooting – in pictures Parents wait for news after reports of a shooting at Marjory Stoneman Douglas High School in Parkland, Florida AP Florida shooting – in pictures Anxious family members wait for news of students AP Photo/Wilfredo Lee Florida shooting – in pictures Students being evacuated from the school AP Florida shooting – in pictures Students being evacuated from the school Getty Florida shooting – in pictures People gather waiting for word from students AP Florida shooting – in pictures Parents waiting for news on their children AP Florida shooting – in pictures People gather at a hotel where students were taken after the shooting Getty Florida shooting – in pictures Florida Governor Rick Scott speaks to the media as he visits Marjory Stoneman Douglas High School following the shooting AFP/Getty Florida shooting – in pictures Dr. Igor Nichiporenko, Medical Director Trauma, left, and Dr. Evan Boyer, Medical Director, Emergency Services, speak about treating victims and the suspect at a press conference outside Broward Health North hospital AP

A gunman attacked the Parkland high school, located about 45 miles north of Miami, with a legally-obtained AR-15-style assault rifle, officials said. Nikolas Cruz, a 19-year-old former student, appeared in court on Monday in the wake of being charged with 17 counts of premeditated murder. He has not yet entered a plea.

Cruz, his head bowed, hands shackled to his waist and wearing a red, jail-issued jumpsuit, showed no emotion during the first procedural session in Fort Lauderdale.

In the second hearing, the judge ordered the release of parts of a mental health assessment of Cruz by the Florida Department of Children and Families in November 2016. The report had already been leaked to a local newspaper.

Florida student Emma Gonzalez passionately calls for gun control at rally after school shooting

Several student survivors have called on Mr Trump and members of Congress to take action on gun control, appearing on news programmes to announce they will lead a nationwide demonstration next month to bring further attention to the issue. Student survivors also gathered with teachers and gun safety advocates on Monday to plan a visit to the Florida state capital of Tallahassee on Wednesday. They will demand state legislators to enact a ban on the sale of assault weapons in Florida.

Also on Monday, the White House announced that the President supports efforts to improve the federal background check system for gun purchases.

White House press secretary Sarah Huckabee Sanders said in a statement that Mr Trump spoke on Friday with Senator John Cornyn, a Texas Republican, about a bill he co-authored with Senator Chris Murphy, a Democrat from Connecticut to bolster the federal background check system. She cautioned that “discussions are ongoing and revisions are being considered” to the measure.

“The president is supportive of efforts to improve the federal background check system,” the statement added.

Over the weekend in Florida, Mr Trump is said to have surveyed members at his Mar-a-Lago resort about whether he should support gun control measures. He told them he was closely watching the media appearances by the student survivors, The Washington Post reported.

As the gun control debate continues to roll around Washington, families of victims of the shootings are burying their children and friends.

More than 1,500 mourners on Monday were said to have attended a church for the funeral of 14-year-old student Alaina Petty, one of the victims of the Parkland massacre,

Family members spoke at Monday’s funeral about how the teen had enthusiastically joined fellow Mormon youth for cleanup efforts after Hurricane Irma struck Florida in September. Her father, Ryan Petty, also spoke about the support the victims’ families have received from their church, the community and others worldwide.