British counterterrorism police arrested a 25-year-old man on Tuesday as part of an ongoing investigation into threats to kill Prime Minister Gordon Brown, Britain's Press Association reported. Lancashire Police said the man was arrested on suspicion of committing offenses under Britain's terror laws. The man, whose name has not been released, was the fourth person to be arrested on terror charges in northern England in the past two weeks. Police are still questioning three men they arrested Aug. 14. Police declined to comment when asked about the case by The Associated Press. Last week, the British Broadcasting Corp. reported that the first three men arrested were being held in connection with a Web site posting signed "al-Qaida in Britain" that threatened the life of Brown and his predecessor as prime minister, Tony Blair. The BBC did not explain the suspects' alleged connection to the Internet posting.