While Thursday’s early-morning bombings in London provided the most recent reminder of the ubiquitous threat of terrorism, the assault was only one in a long series of subway attacks across the globe. It is important to note, however, the incidents listed below only include subway-related attacks, not fatal accidents.

Baku, Azerbaijan, 1994 - Members of a Northern separatist party set off several bombs in the subway systems of the country’s capital. At least 20 died, while hundreds more were injured over the course of the year.
Tokyo, Mar. 20, 1995 - Twelve were killed and more than 6,000 injured when a religious cult named Aum Shinrikyo released sarin gas in five coordinated locations. The group carried out the attack to ostensibly hasten the apocalypse, but much to their undoubted chagrin, it only brought about the hangings of several key leaders following an extensive investigation.
Paris, July 1995 - Throughout the month, the Algerian Armed Islamic Group set off crude, homemade explosive devices that killed eight and seriously injured more than 200.
Paris, Dec. 3, 1996 - A bomb was set off as a train approached the Port Royal Station. Two people were killed and about 90 were injured. No one claimed responsibility, but Algerian extremists -- a group notorious for terrorizing parts of France -- were suspected.
Moscow, Feb. 5, 2001 - A rush-hour bomb killed 15 in an attack Russian officials blamed on -- but never could prove was done by -- Chechen rebels.
Daegu, South Korea, Feb. 18, 2003 - For reasons still unknown, a single arsonist sparked a massive fire in a Daegu station that killed more than 100 people.
Moscow, Feb. 6, 2004 - Chechen rebels exploded a bomb at the height of rush hour that killed 39 while injuring more than 100.
Madrid, Mar. 11, 2004 - In a series of coordinated attacks, 10 bombs exploded on four different commuter trains, killing 191 and injuring an additional 2,000 people. The al-Qaida-linked group Euskadi Ta Askatasuna claimed responsibility.

Information in this fact sheet compiled from various sources.