British Airways 747 plane evacuated before take-off due to smoke in cabin

British Airways Flight BA288 scheduled en route from Phoenix (Arizona, USA) to London Heathrow reported smoke in the cabin while heading to runway for take-off. The incident occured at 11p.m (E.T), around 100 firefighters and medical staff were displace to the site and all 298 passangers of flight 288 were evacuated. There were reported 15 passangers with just minor wounds. The rescue teams could not localize the source of fire even if using a thermal imaging camera and suppose the smoke came up from electrical problems. The BA engineers examine the plane.
Luckily the incident happened while plane still grounded and not somewhere above Atlantic.