The U.S. Transportation Security Agency (TSA) will soon use more behavioral profiling at airports to detect suspicious activity, a top official said Thursday. TSA Director Kip Hawley said the agency would expand a program that has trained officers to observe passengers' behavior currently at 12 airports. He said it will be expanded after the summer travel season. “We are looking at expanding … as another layer of security,” Hawley said. “We have been very pleased with its effectiveness. We expect it to be an important part of our security” in the future. TSA officials would not identify which “highest risk” airports will be included in the expanded program. The program began at Boston's Logan International Airport. It also is being implemented in Miami, among other airports. Under the program, security personnel are taught to look for abnormal behavior in passengers, such as people acting nervous or people wearing coats when it is warm to hide bombs.