DANVILLE — An elderly couple dressed in winter clothing, including ski masks, caused a brief lockdown Friday morning at Diablo Vista Middle School, officials said.

Police were notified by a caller around 10 a.m. who said they saw people wearing ski masks and heavy jackets near the school at 4100 Camino Tassajara.

As a precaution, the school went into lockdown.

Police walked the school grounds and nearby Diablo Vista Park and determined the individuals were an elderly couple wearing heavy coats and ski masks because of cold weather, authorities said. At 10 a.m., the temperature was in the low 50s with a slight wind chill.

The lockdown was soon lifted.

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