Crowds gather in the wake of the latest mass shooting at a school in the US

A rally is taking place in Florida, where people are calling for gun control measures to be introduced after a school shooting left 17 people dead.

The US State's governor's urged the head of the FBI to quit, criticising the agency for failing to act on a tip-off warning suspect Nikolas Cruz might carry out an attack.

This student attends the school where the tragedy happened and explains why she's taking part in the demonstration.