This is breaking, so I'll post the CNN background article:
Sky News is apparently confirming this arrest. Nashar should have turned himself in to Scotland Yard. Being caught in Cairo means the gloves are off.
British police said Friday they were "aware" that a man has been arrested in Cairo in connection with the London bombings.
Scotland Yard did not confirm media reports that the man arrested was Magdy El-Nashar, an Egyptian biochemist being sought for questioning in connection with the bombings.
The Associated Press quoted an Egyptian government official as saying El-Nashar was arrested in Cairo early Friday and was being interrogated by Egyptian authorities.
Law enforcement officials told CNN the FBI was investigating the background of El-Nashar, who earned a doctorate in biochemistry from Leeds University this year, the university said.
Sky News is apparently confirming this arrest. Nashar should have turned himself in to Scotland Yard. Being caught in Cairo means the gloves are off.