But the birds escaped the attack and were scattered across the site before being found back together in their eyrie on Wednesday.
The RSPB said it had talked with quarry staff and was looking at whether it could get 24-hour security in place in order to prevent further attacks taking place. Police are now investigating the circumstances of what took place to try and discover who was responsible.
Quarry staff found a rope which had been left above the nest site following the incident, the RSPB have confirmed. Its possible who ever was responsible took fright after all three chicks took fright and flew out of the nest taking refuge in other parts of the quarry.
Alan Firth, from the RSPB investigations team, said: “It’s been a fairly anxious period until we found them. “People need to be aware it is a criminal offence if they disturb a nest of rare breeding birds.” The quarry site had not been disclosed to help protect the nest location.