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The weekend's memorial activities have occurred in the shadow as Rick mentioned other new terror threat of an attack on the US homeland.
National correspondent Catherine Herridge has an update.
-- visible security in the two cities targeted by al-Qaeda a decade ago US officials tell fox there's still no evidence to substantiate the car bomb threat.
And still no evidence to show al-Qaeda moved operatives into the country quote.
We are turning over every stone one official said and it may go one well beyond today about -- FOX News Sunday that what has -- tears and advisor said the intelligence could not yet.
-- I think we have an obligation to the American people I think we have an obligation to the families of the victims of the 9/11 attacks to do everything possible that we can.
To see what it is that might be out there.
Since Thursday when this FBI Homeland Security bulletin warning of a possible car bomb plot was issued.
Databases travel and phone records have been analyzed one US officials say quote pools of names have -- but so far have not panned out.
We don't have a smoking gun yet it -- it's gonna take a little bit I think.
To completely flush this out we certainly hour by hour.
We are learning more.
Most concerning to law enforcement is the claim that American citizens or those with documentation to be in the US such as Green card holders may be involved.
It's a growing trend according to the former Homeland Security secretary.
We've seen an uptick in home grown terrorism.
Not surprisingly -- -- terrorists overseas are part trying to recruit people in place you know we have that situation -- carry out attacks.
And -- -- across the nation marked the murder of nearly 3000 Americans senior members of congress are warning of Al qaeda's next step.
That al-Qaeda will continue.
In whatever way shape or form out of Yemen with new explosives to try and come after us.
I'll cut -- -- many affiliate considered the most active in -- by US officials was behind the last two major plots against the US.
And it has the added cachet of an explosives expert.
And the cargo printer bonds a year later.
The head of the House Intelligence Committee frame the debate this way.
If you walk away from this fight they will fill that void and they will be back.
But today the Secret Service confirmed to fox at three threatening messages were posted on the white has FaceBook page they include a picture of Osama bin Laden a promise of retaliation.
And this in the way the day it was written messages came from overseas -- were taken down and there was no further comment from the Secret Service perhaps.
Captain thank you grew -- while President Bush.
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