U.S. homeland security officials monitoring situation after Turkish blast

WASHINGTON (Reuters) - U.S. Department of Homeland Security officials are monitoring the situation after attacks at Turkey's main Istanbul airport and have been in touch with U.S. and international counterparts, a department spokeswoman said. The department and its partners "routinely adapt both seen and unseen security measures in order to counter evolving threats," spokeswoman Marsha Catron added. (Reporting by Diona Chiacu; Writing by Susan Heavey; Editing by Chris Reese)