The £300m development was targeted a day after an approved security firm started guarding the area.
A digger was destroyed in the attack.
Milne Management security, which won the contract, is approved by the Security Industry Authority.
Police and politicians are working together to tighten the contracts run by security firms in the wake of a firebomb attack at the site of the Commonwealth Games athletes’ village in Glasgow.
The £300m development was targeted a day after an approved security firm started guarding the area.
A digger was destroyed in the attack.
Milne Management security, which won the contract, is approved by the Security Industry Authority.