Hundreds of DHS employees - some charged with guarding our borders - are being sent to assist with the aftermath of hurricane Katrina. While help is desperately needed in LA and MS to deal with that disaster, it's important not to (literally) let our guard down and allow terrorists and others to take advantage of the situation.

This article says it involves "more than 200 Border Patrol agents and 300 other U.S. Customs and Border Protection personnel". They join 1800 from FEMA and 4000 from the Coast Guard:

...But T.J. Bonner, president of the National Border Patrol Council, argued that Border Patrol was already stretched too thin, and deployment of officers would make a difficult situation on the border even worse...

..."The resources that have been deployed are throughout the United States," [Mario Villarreal, spokesman for U.S. Customs and Border Protection] said, declining to name the Border Patrol sectors from which employees have been deployed. "That mitigates any possible operational impact."

Sep. 2's "U.S. Border Patrol Moved to Katrina Area, Border Vulnerable" says:

...As CBP [Customs and Border Protection] pointed out to NewsMax, its relief teams in the New Orleans area are not by any means gratuitous. The proliferation of ports of entry in the area means that the agency has a large number of CBP personnel regularly on the ground. Many of these CBP personnel were hit by the storm and are in need of relief.

In other words, the agency to some measure is riding to the relief of its own troops...

As for where they're coming from, this article says:

There are 14 specially trained Immigration and Customs Enforcement Officers from El Paso, are on their way to help restore order in the wake of Hurricane Katrina... The 14 ICE detention officers should arrive in Louisiana Friday night.

From "San Diegans will help keep order":

More than two dozen San Diego-based federal agents and Coast Guardsmen traveled over the weekend to areas hardest hit by Hurricane Katrina to assist with law enforcement and recovery efforts.

Twelve agents from U.S. Immigration and Customs Enforcement [left for NOLA]...

...Fifteen more special agents are on standby, Mack said, as are 30 agents from the agency's Office of Detention and Removal...

And, it's not just our southern border that's affected:

More than a dozen local immigration officers boarded a bus in Angola overnight to help enforce the law across Louisiana...

It's an important mission for immigration officers who normally protect our border with Canada.

Monday morning, they boarded a bus heading for New Orleans. They're all members of the Immigration and Customs Enforcement Office here in Western New York...

While it's important to aid the victims of Katrina, and that was natural disaster and not an attack, those making these decisions might want to consider the definition of the word "feint":

A feint attack is designed to draw defensive action towards the point under assault. It is usually used as a diversion; to force the enemy to concentrate more manpower in a given area so that the opposing force in another area is weaker.