NY1 VIDEO: On July 7, 2005, four suicide bombings in London - three in the Underground train system, another aboard a city bus - killed 52 people and injured 700 more. For many, the terror attacks conjured memories of Sept. 11. NY1's Roger Clark filed the following report.

NY1 FOLLOW-UP: Exactly two weeks after the July 7 suicide bombings, terrorists attempted to set off four more bombs around London but none of them detonated properly. The attacks led to sweeping changes in security in the city, as the NYPD began randomly searching subway riders' bags when entering the system.