SAN FRANCICSO (AP) — The lead attorneys probing a deadly pipeline explosion for California regulators have abruptly quit the investigation, putting the integrity of the probe in jeopardy, a San Bruno city official said Wednesday.

The four California Public Utilities Commission lawyers removed themselves from the matter earlier this week, just as the agency is poised to decide a fine for Pacific Gas & Electric Co., which owns the pipeline that ruptured in San Bruno, City Manager Connie Jackson said.

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