TERRORISM expert Prof Paul Rogers, of Kirkburton, said the attacks on London were a "grim development".
He predicted there would be a redoubling of efforts to combat terrorism and said it was crucial to undermine al Qaida's continuing success at recruitment.
"We have had more attacks by al Qaida groups in the three-and-a half years since 9/11 than there were in the same period beforehand," he said.
"We have to get to grips with that and undermine it at its root."
Prof Rogers, who works in the Peace Studies Department at Bradford University, said security experts had predicted Britain was the terrorists' most likely target.
"The unwritten assumption was that Britain and Italy would be the next targets because of their closeness to the US administra- tion," he said.
"After Spain, people have tended to think that Britain was the most likely target."
The professor added that the strike on both buses and Tube trains was a grim development in the terrorists' tactics.
"It means one doesn't just have the impact of the explosions, but one brings the centre of the city to a halt," he said.
"I think that is a rather grim development."