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Hey there from CNN. I'm Krista Bo with the five things you need to know for Tuesday, December 17th.

Madison Police say they're looking into online posts and a possible manifesto

after a 15-year-old female student opened fire at Abundant Life Christian School.

A teacher and a student are dead, and six other people are injured, two of whom are in critical

condition.

Police chief Sean Barnes told CNN a letter had been posted online by someone, claiming to be the shooter's friend.

We haven't been able to locate that person yet, but that's something we're going to work on today.

We'll also be looking through her effects if she had a computer cell phone

to see if there are any tr transmissions between her and someone else.

Police are also investigating whether the student's parents owned or possessed the gun used in the shooting.

A candlelight vigil is set to take place later today to pay tribute to the victims.

Amid a surge in reported drone sightings, local politicians are urging federal officials for more

information and proposing options to address the issue. There's anti-drone legislation being floated

in Congress. Pennsylvania's governor says there are helicopters monitoring the skies over the state,

and sources tell CNN the feds are sending drone detection and tracking systems to two military facilities in New Jersey.

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