Scores of undocumented immigrants from Central America have been released at Greyhound Lines Inc. bus stations in Tucson and Phoenix over the past several days after they were flown to Arizona from south Texas, officials acknowledged.

Andy Adame, a spokesman for the Border Patrol in Tucson, confirmed that over the weekend federal officials flew about 400 migrants apprehended in the Rio Grande Valley of Texas to Tucson to be processed. He said the migrants were flown to Arizona because the Border Patrol does not have enough manpower to handle a surge in illegal immigrants in south Texas…

“This is a huge concern,” said Ira Mehlman, a spokesman for the Federation for American Immigration Reform, a Washington, D.C.-based group that advocates for more immigration and border enforcement.

“This is exactly the incentive for people to cross the border illegally,” he said.