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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 | 32,627.97 | -234.33 | -0.71% |
| Nasdaq | 13,215.24 | 99.07 | 0.76% |
| S&P 500 | 3,913.10 | -2.36 | -0.06% |
| Treasuries | 1.73 | 0.00 | 0.12% |
| Company | Price | Change | % Change |
|---|---|---|---|
| Ford Motor Co | 8.29 | 0.05 | 0.61% |
| Advanced Micro Devic... | 54.59 | 0.70 | 1.30% |
| Cisco Systems Inc | 47.49 | -2.44 | -4.89% |
| General Electric Co | 13.00 | -0.16 | -1.22% |
| Kraft Heinz Co | 27.84 | -2.20 | -7.32% |
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