ALBANY (CBS SF) — Police activity due to an incident on westbound I-80 in Albany late Friday morning shut down lanes and eastbound I-580 connector ramp for hours until finally reopening just before 4 p.m., according to authorities.

The 511.org Twitter account first posted about the incident on westbound I-80 near Buchannan Street shortly before 11:30 a.m.

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CHP initially reported that the activity had shut down the right lanes and the entrance ramp.

Authorities later issued a severe traffic alert due to the police activity. As of 2:33 p.m., the right lanes of westbound I-80 and the eastbound I-580 connector-ramps to both eastbound and westbound I-80 remained closed.

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Traffic was diverted off at Buchanan Street.

CHP announced that all lanes of westbound I-80 and the connector ramps were reopened shortly before 4 p.m.

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So far, authorities have not confirmed the nature of the police activity, but there were reports of a possible freeway shooting investigation. No details have been made available.