Mark Memmott

As the last U.S. combat troops prepare to leave Iraq, the question of whether neighboring Iran will try to fill any vacuum looms large.

The last total lunar eclipse of 2011 — and the last one until April 15, 2014 — occurs Saturday morning.

The news that Rep. Michele Bachmann (R-Minn.) and Gov. Rick Perry (R-Texas) have decided not to participate in the Dec. 27 Republican presidential debate that businessman/TV personality/self-proclaimed potential independent presidential candidate Donald Trump is supposed to be moderating means just two GOP contenders would be left for the event:

Former House Speaker Newt Gingrich (Ga.) and former Sen. Rick Santorum (Pa.).

Virginia State Police and other officials briefed reporters this morning about Thursday's shooting on the campus at Virginia Tech, in which a campus police officer was killed and the suspect apparently later shot himself and died. We updated as it happened and put those posts in chronological order after the briefing was over.

Good morning.

Our early headlines:

-- Slain Virginia Tech Officer's Dash Cam Shows Suspected Shooter.

-- U.K. Isolated As Euro Nations Move Ahead On New Pact.

Horrific news from Kolkata, India:

"A basement fire sent flames and smoke coursing through a seven-story Indian hospital Friday, killing 73 people," The Associated Press reports, "and officials accused hospital staff of abandoning many patients to die of suffocation."

There's been movement today in Brussels, where leaders from the European Union nations are trying to save the euro and restore some faith in the financial markets that they can manage the euro zone's debt crisis. But an important division remains among the 27 nations.

The consensus among news outlets covering the story seems to be:

-- "UK Isolated As Europe Moves Ahead On Fiscal Union." (Reuters)

It still isn't known why a man apparently walked up to a campus police officer at Virginia Tech yesterday and fatally shot the 39-year-old father of five. And the identity of the gunman, who authorities believe died of a gunshot wound shortly after the attack, hasn't yet been released.

Virginia Tech has advised everyone on campus to "seek shelter or stay where you are" because of reports about shots being fired there.

It adds that:

"[A] suspect described as white male, gray sweat pants, gray hat w/neon green brim, maroon hoodie and backback" was seen "on foot towards McComas" — the university's athletics facility.