It all began about 10:45 this morning Eastern Time.

Police say 24-year-old Mohammed Abdulazeez opened fire on two military recruiting stations, killing four Marines, wounding a female Navy sailor and a police officer.

The sailor is in surgery tonight.

Witnesses report the shooter did not enter the buildings, rather he fired from outside.  Dozens of shots were heard.

Reports say Abdulazeez was trapped in the woods after a chase and was killed by law enforcement.  We are awaiting further details on that.

Here's what we know about the terrorist.

He graduated from the University of Tennessee in 2012 with a degree in engineering.

We believe he is an American citizen born in Kuwait, but that has not been confirmed.

His father works for the city of Chattanooga and the family is middle class.

On the victim front, we are awaiting the identities of the four murdered Marines pending the notification of their families.

The FBI is now in charge of the investigation, and the Associated Press is reporting that authorities raided the shooter's house, taking two women into custody.

We are also awaiting more word on that situation.

Earlier today President Obama said this:

PRESIDENT OBAMA: “I’d ask all Americans to pray for the families who are grief stricken at this point, and I want everyone to understand that we will be thorough and prompt in figuring out exactly what happened.”

In just a few moments, three Fox News correspondents will report on what that investigation will entail.

But there is one sensational report that I have to mention, even though it is not clear what exactly happened.

Apparently a tweet from an ISIS-based source announced the terror action before it actually happened.  Catherine Herridge is on that story and will join us shortly.

If ISIS is involved even indirectly, all hell will break loose in this country.

For months those savages have been encouraging people on the net to attack Americans.

As you know, the Obama administration's response to the growing menace of ISIS has been long-term, not an urgent campaign.

Expect that to change if Muhammad Abdulazeez is linked to the terror group.

There have been a number of terror attacks in the USA since 9-11.

The shoe bomber in 2001, the Fort Hood attack in 2009, the Boston Marathon bombing in 2013 … just to name the most infamous.

But there has not been an ISIS attack that has succeeded.

On a night like this when the nation faces the fact that four Marines were killed on American soil, restraint is necessary.

The FBI will quickly gather the facts and after they are presented to the public, then and only then should a calculated reaction take place.

I firmly believe that President Obama is making a major mistake in the tentative nature of his response to ISIS, and I have said that many times.

I hope Mr. Obama's strategy will change because ISIS is a direct threat to all Americans even if it turns out they were not involved in the terror attack today.

And that's the memo.