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NEW YORK (CNNMoney.com) -- Shares of Pacific Gas & Electric tumbled 6% Friday after a gas pipeline in California exploded and erupted into flames.
The blast occurred in San Bruno, near San Francisco, after a gas transmission line owned by PG&E (PCG, Fortune 500) ruptured. But the cause of the rupture is still being investigated.
The explosion, which took place late Thursday, killed four people and sparked a fire that has destroyed dozens of homes.
Shares of the utility company dropped $2.91, or 6%, to $45.34 in afternoon trading Friday.
CNNWires contributed to this report. 
| Index | Last | Change | % Change |
|---|---|---|---|
| Dow | 12,874.04 | 72.81 | 0.57% |
| Nasdaq | 2,931.39 | 0.00 | 0.00% |
| S&P 500 | 1,351.77 | 9.13 | 0.68% |
| Treasuries | 1.99 | 0.02 | 1.07% |
| Company | Price | Change | % Change |
|---|---|---|---|
| Bank of America Corp... | 8.25 | 0.18 | 2.23% |
| Sprint Nextel Corp | 2.31 | 0.02 | 0.87% |
| General Electric Co | 19.07 | 0.20 | 1.03% |
| Citigroup Inc | 32.88 | -0.04 | -0.12% |
| Ford Motor Co | 12.54 | 0.10 | 0.80% |
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