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Teenagers killed in third shooting to rock Orlando in a week.

Orlando has been rocked by its third shooting in a week after two teenagers were killed only days after the deaths of Voice singer Christina Grimmie and 49 people in the Pulse nightclub massacre.

The boys, aged 16 and 18, were found lying in the front yard of a house in Pine Hills, Florida, suffering from gunshot wounds about 10.45pm (12.45pm AEST).

They were rushed to hospital but died from their injuries, according to local TV station WESH.ccc

Witnesses reported seeing a dark-colored vehicle leave the scene immediately after the shooting.

This comes in what has already been a horror week for Orlando.

Christina Grimmie was brutally murdered by an obsessed fan.

On Saturday, Christina Grimmie was fatally shot by crazed fan Kevin Loibl when she was signing autographs after a concert.

The following day, mass-murderer Omar Mateen gunned down 49 party-goers at the gay club Pulse and injured 50 others. It has since become the worst mass shooting in US history.

Watch CNN's emotional tribute to Orlando shooting victims. Post continues after video...

On Tuesday, two-year-old boy Lane Graves when he was dragged into the water by an alligator at a Disney World resort.