Students and school staff across the US are commemorating the Florida school shootings with a walkout, exactly one month after the killings.

They are stopping lessons for 17 minutes in memory of the 17 people killed at Marjory Stoneman Douglas High School.
Pupils at the school, which was targeted by a former student, hugged each other on the football field.
Protest organisers accuse Congress of failing to tackle gun violence.
The White House revealed a plan this week to deter school shootings which does not include President Donald Trump's repeated calls to raise the age for buying semi-automatic rifles to 21.
Instead, it moves ahead with his controversial proposal to provide firearms training to school employees.