PARKLAND, Florida. — Students returned to Marjory Stoneman Douglas High School on Wednesday, bearing white roses and wearing white ribbons to commemorate the 17 people killed there two weeks ago in the second deadliest public school shooting in US history. The mood was subdued as roughly 3,000 teenagers walked past hundreds of uniformed police officers to resume classes at the school in the Fort Lauderdale suburb of Parkland. The building where most of the victims died will remain closed indefinitely, however. Parents who had never accompanied their children to high school tagged along with their teens to offer moral support. Jeannine Gittens, 44, and a friend and fellow mother, had gone ahead of their sons to greet them as they came off the bus. We just wanted to make sure they know we are there and that they have our support, said Gittens, who said her son Jevon, 16, and his friend had ridden the bus alone because they wanted to make today feel as normal as possible. Freshman Nicholas Rodrigues, 15, said he decided to walk the mile (1.6 km) from his home in neighboring Coral Springs rather than ride his bicycle as usual because wanted to think about things. Even as students went into the sprawling Douglas campus, supporters remained gathered outside. We feel for these kids so much, said Beverly Turner, a 63-year-old youth pastor, who said she had two children who graduated from the school. We've seen them grow up and us being there for them is the least we can do. Investigators have accused 19-year-old Nikolas Cruz, who had been kicked out of the school for disciplinary reasons, of carrying out his attack with a legally purchased AR-15 assault-