LONDON (Reuters) -Britain’s counter-terrorism police are now leading the investigation into an incident in which petrol bombs were thrown at an immigration centre in the southern English port of Dover, police said on Tuesday. “What appears clear is that this despicable offence was targeted and likely to be driven by some form of hate filled grievance, though this may not necessarily meet the threshold of terrorism,” police said. Police also identified the suspect who threw the bombs at the immigration centre on Sunday as Andrew Leak, a 66 year-old man from High Wycombe, southern England, who w…