MIDLAND (AP) — The number of people injured in a series of explosions on a West Texas natural gas pipeline has risen to seven.

Authorities initially said five people — a volunteer firefighter and four pipeline employees — were hurt Wednesday when the explosions happened about 20 miles southeast of Midland. But city spokeswoman Elana Ladd tells KOSA-TV in Odessa that two others also were hurt.

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Ladd didn’t immediately return a phone message Thursday to say whether the other two victims were firefighters or pipeline workers.

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Authorities say firefighters had suppressed the fire from the initial explosion when two explosions followed in quick succession.

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Authorities haven’t said what caused the explosions.