1.   An explosion ripped through a regional subway train during rush hour Tuesday, setting off a blaze and killing at least four people, authorities said.

2.   An explosion occurred on a Parisian regional subway line during rush-hour Monday, causing a number of injuries, police said.

3.   An explosion ripped through a regional subway train during rush hour Tuesday, setting off a blaze and killing at least three people, authorities said.

4.   An explosion tore through a regional subway station in the heart of Paris during the evening rush hour Tuesday, firefighters said.

5.   The blast at Saint Michel regional subway station in the Latin Quarter was the first to hit central Paris since a wave of bombings nearly a decade ago.

6.   There were no arrests, and the group was escorted to a regional subway station.

7.   Regional subway services were almost at a standstill preventing thousands of people from reaching their places of work.