To their stunned friends and neighbors in a housing project in north London, the Alis were known as quiet, struggling parents and observant Muslims who showed no signs of terror ties.

Of course they were.

Cossor, a British citizen like her husband, lived with her parents and two older sisters before marrying Ali three years ago. The couple moved into the project and were receiving government assistance.

Of course they did.

Cossor’s grandfather Nazir Ahmed, 84, said Ali made an unexpected visit to Pakistan about four weeks ago.

“We didn’t understand what the hurry was and why he had to go on his own,” he told The Mail on Sunday.

Well, Mr. Ahmed, it’s because your grandson Ali was hatching a plot to blow up his own baby, along with a plane full of other people all in the name of Allah.