A huge explosion forced the evacuation of the UC Berkeley campus Monday night.

A generator near the library was reportedly the source of the explosion. Campus police immediately began evacuating the area.

https://twitter.com/EdalatAzadi/status/384860155122163712

Students and others at the scene tweeted their concern.

https://twitter.com/_emmsies/status/384858463706181633

https://twitter.com/yeseniaa_11/status/384860368499003394

The Daily Californian reports that electrical problems plagued the campus earlier in the day.

The campus is currently looking into an attempted theft of copper from the campus high-voltage system, which may have led to the outage, [communications director Christine] Shaff said.

Although backup generators had kicked in across campus, Shaff could not confirm when full power would be restored but said high-voltage crews have identified the problem and are working on ways to fix it.

Other crews have a list of the elevators people are trapped in and are currently working to get them out, she said.

https://twitter.com/FuryalMahmood/status/384833685964353536

Here’s video of the explosion, caught from a distance but giving a good idea of the confusion immediately following the blast.

As the Daily Californian suggested, it’s possible the explosion is linked to the theft of copper grounding wire last week.