Multiple people were shot Monday morning in an apparent murder-suicide at North Park Elementary School in San Bernardino, California.

San Bernardino County fire spokesman Eric Sherwin said numerous firefighters and police officers are headed to the scene, per the AP, and San Bernardino Police Chief Jarrod Burguan tweeted the following:

"Preliminary info is 4 victims, being treated. Suspect is possibly down as well... Joint response from @SanBernardinoPD sheriff, school police and CHP. ... We believe this to be a murder suicide. Happened in a class room. Two students have been transported to the hospital. ... Students at the school are be taking to cajon high school for safety. Two adults are deceased in a classroom, believed to be a murder suicide. We believe the suspect is down and there's no further threat. ... There are two wounded, possible students. Taken to local hospitals, condition unknown..."

A San Bernardino school spokesman said Monday that one of the four victims was a teacher.

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Supreme Court denies Pennsylvania GOP request to limit mail-in voting

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The Supreme Court on Monday denied a request from Pennsylvania's Republican Party to shorten the deadlines for mail-in ballots in the state. Thanks to the court's 4-4 deadlock, ballots can be counted for several days after Election Day.

Why it matters: It's a major win for Democrats that could decide the fate of thousands of ballots in a crucial swing state that President Trump won in 2016. The court's decision may signal how it would deal with similar election-related litigation in other states.

Microphones will be muted during parts of Thursday's presidential debate

Photos: Jim Watson and Saul Loeb/AFP via Getty Images

The Commission on Presidential Debates adopted new rules on Monday to mute microphones to allow President Trump and Joe Biden two minutes of uninterrupted time per segment during Thursday night's debate, AP reports.

Why it matters: In the September debate, Trump interrupted Biden 71 times, compared with Biden's 22 interruptions of Trump.

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