March 24 (Reuters) - Two suspected undocumented immigrants suffocated to death aboard a freight train and 10 others in need of medical care were taken by helicopter or ambulance to hospital on Friday in south Texas, police said. Officials in Uvlade, Texas, received an anonymous emergency 911 call advising them that numerous immigrants were suffocating inside a train, Uvalde police said in a statement. Homeland Security had yet to determine the nationalities of the victims or whether any families or children were among them, a department official with knowledge of the matter said, speaking on condition of anonymity