The US state department will begin revoking the US passports of thousands of parents who owe a significant amount of unpaid child support. The department told the Associated Press on Thursday that the revocations would begin on Friday and be focused on those who owe $100,000 or more. That would apply to about 2,700 American passport holders, according to figures supplied to the state department by the Department of Health and Human Services (HHS). The revocation program, plans for which were first reported by the AP in February, soon will be greatly expanded to cover parents who owe more than $2,500 in unpaid child support – the threshold set by a little-enforced 1996 law, the state department said. It was not clear on Thursday how many passport holders owe more than $2,500 because HHS is still collecting data from state agencies that track the figures, but it could encompass many more thousands of people, officials said.…