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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 | 15,354.40 | 121.18 | 0.80% |
| Nasdaq | 3,498.97 | 33.73 | 0.97% |
| S&P 500 | 1,667.47 | 17.00 | 1.03% |
| Treasuries | 1.95 | 0.08 | 4.50% |
| Company | Price | Change | % Change |
|---|---|---|---|
| Bank of America Corp... | 13.43 | 0.07 | 0.52% |
| Cisco Systems Inc | 24.24 | 3.03 | 14.29% |
| Microsoft Corp | 34.87 | 0.79 | 2.32% |
| Ford Motor Co | 15.08 | 0.44 | 3.01% |
| General Electric Co | 23.46 | 0.19 | 0.82% |
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