Here's a story that hasn't been reported (it may have caused panic here) - you're hearing it first from me:
A couple of days after the attack two arabic men were acting suspiciously at a convenience store here. This store is in a very rural area near the border beside the highway the comes from Naco and Agua Prieta, Mexico. These men were attempting to make a phone call on the pay phone outside the store but they couldn't seem to figure out how to complete the call. The cashier saw them and the way they were acting and called the Border Patrol. In the meantime, a regular to the store and a friend of my wife's was in the store and saw the men too. He decided to find out more about what they were doing, because he too was suspicious, and he went over to "help" them make the call.
The phone number they were attempting to dial was written on the back of a business card from a Mexican taxi company. He acted like he was helping them, but he really was trying to detain them until law enforcement showed up and to at least obtain the phone number from the card. He took the card under the guise of trying to decipher the written phone number and wrote it on his hand with an ink pen. The men weren't very happy about that and in broken english they kept trying to tell him to give the phone number back. He gave it back and kept "helping" them make the phone call.
Back in the store the cashier was forwarded by Border Patrol to the FBI. She explained the situation and the FBI dispatched agents to the store.
The FBI agents arrived and the arabic men were taken into custody.
My wife heard this story about a week ago from her friend, the man that "helped" the men NOT complete the call and who kept them busy until the FBI arrived. She related the story to me and I've related it here to the best of my ability.
That's two who crossed the border and attempted to get into the country. How about all the rest who have successfully made it across that we don't know about?