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Gas explosions have plagued Philadelphia in the past

 Shown on Jan. 19, 2011, is the site of a gas main explosion in Philadelphia. The gas main explosion, which was caught on video, sent a 50-foot fireball into the sky, killing a utility worker, injuring five other people and forcing dozens of residents from their homes.  (AP Photo/ Joseph Kaczmarek)

Shown on Jan. 19, 2011, is the site of a gas main explosion in Philadelphia. The gas main explosion, which was caught on video, sent a 50-foot fireball into the sky, killing a utility worker, injuring five other people and forcing dozens of residents from their homes. (AP Photo/ Joseph Kaczmarek)

If the Fire Department finds that today’s explosion and building collapse in South Philadelphia were caused by a gas leak, it won’t be the first time. Gas-related explosions have been a big issue in Philadelphia.

Just this month, the Pennsylvania Public Utility Commission fined the Philadelphia Gas Works $500,000 for missteps related to a fatal explosion in 2011.

Here’s a list of some of Philadelphia’s worst natural-gas-related explosions in recent memory.

2011

The January explosion in Tacony that killed a 19-year-old PGW worker also injured five other employees and destroyed a rowhouse. The PUC found that PGW had failed to shut off gas mains and electricity to the neighborhood after sending its workers to resolve a gas leak in the area.

This July, PUC fined the gas company $500,000 for failing to follow safe procedures.

2000

An explosion at PGW’s South Philadelphia refinery complex injured the plant manager. Because the fire erupted in an industrial area with few homes, no one else was hurt. The incident left much of South and West Philadelphia temporarily without heat.

1985

Three people died in a blast that destroyed four rowhouses in West Kensington. The explosion was caused by a crack in one of PGW’s 8-inch, cast-iron gas mains.

1979

Two almost simultaneous explosions in Tacony destroyed three buildings, killing seven and injuring 19. The explosion was caused by a cracked gas main.

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