LONDON UPDATE: “The British-born mastermind of the London attacks had direct links with al-Qaeda, police sources confirmed yesterday.”

UPDATE: Another arrest:

CAIRO, Egypt (AP) – An Egyptian biochemist arrested Friday in Cairo in connection with the London bombings taught at a British university after taking graduate courses in North Carolina.

Magdy el-Nashar, 33, was arrested early Friday, an Egyptian government official said on condition of anonymity because an official announcement of the arrest had not been made. El-Nashar was being interrogated by Egyptian authorities, the official said.

Stay tuned.

ANOTHER UPDATE: El-Nahsar bio here.