5 Things to Know This Morning

March 21, 2013 — -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Gaza Militants Fire at Israel During Obama Visit

Rockets were fired from Gaza toward the Israeli town of Sderot as President Obama heads to the West Bank for talks with President Mahmoud Abbas. This is the second rocketing incident since the ceasefire following an 8 day conflict in November.

2. Chopper Crash in Australia Leaves 4 Dead

A helicopter crashed near Sydney, Australia, killing all four people on board. A spokesman said something appeared to go wrong when the helicopter tried to land on Thursday afternoon local time.

3. Cops Seeking Suspect in Colorado Prison Chief's Shooting

Police are still searching for traces of the person who shot the man who oversaw Colorado's public and private prison system. Authorities have not confirmed if the shooting was random or if Tom Clements was a target.

4. Names of Marines Killed in Nevada Released

The military has released the names of seven Marines who were killed in an explosion during a training exercise in Nevada earlier this week. They were part of the 2nd Marine Expeditionary Force in North Carolina.

5. No Winner for $260M Powerball Jackpot

Powerball officials tell ABC News that no one matched all of the winning numbers from Wednesday night's Powerball. The jackpot was worth an estimated $260 million.