A second lawsuit has been filed by opponents of the Golden State Warriors' proposed arena in San Francisco.

The suit alleges San Francisco officials violated state environmental review laws when they approved it.

The lawsuit was filed in Sacramento County Superior Court by the Mission Bay Alliance, a group opposing the 18,000-seat arena's location at 16th and Third Streets, which is across the street from a hospital.

The alliance, which describes itself as a group of UCSF stakeholders, donors, faculty and physicians, has argued that the project will create major traffic delays around the hospital.

The group argues that the city failed to properly consider alternative locations for the arena and environmental impacts on traffic, air quality and noise.

In particular, the group alleges that game-day traffic could hinder ambulances and block access to life-saving care.