By Doina Chiacu WASHINGTON (Reuters) – Target Corp missed multiple opportunities to thwart the hackers responsible for the unprecedented holiday shopping season data breach, U.S. Senate staffers charged in a committee report released on Tuesday. There was no indication the No. 3 U.S. retailer responded to warnings that malware was being installed on Targets system. Other automated warnings the company ignored revealed how the attackers would carry data out of Targets network, according to the report. This analysis suggests that Target missed a number of opportunities along the kill chain to stop the attackers and prevent the massive data breach, according to the Commerce, Science and Transportation Committee report.