A 30-year-old man is admitted to ICU following a road traffic collision with a pelvic fracture and haemodynamic instability. Pelvic binder has been applied. He has received 4 units of packed red cells and 4 units of FFP. Lactate is 6.5 mmol/L. CT shows active arterial extravasation from branches of the internal iliac artery. What is the next most appropriate intervention?