Interviewee calls U.K. terror incident "very serious," praises British cooperation

Secretary of State Marco Rubio described a recent weekend incident in the United Kingdom as "a very serious situation," and thanked U.K. authorities for their cooperation while saying there are limits to what he could disclose publicly.

"Suffice it to say that what happened, what almost happened, what could have happened in The UK over the weekend is a very serious situation," Rubio said, adding that some aspects "involve the hands of a foreign actor" and that more information would emerge in the days to come. The interviewer had noted that some suspects were reportedly released on bail and asked how grave the threat remained.

Rubio declined to elaborate on specific operational details on air but said U.S. officials were engaging with British investigators and that the cooperation he described was "very helpful." He did not specify which foreign actor he was referencing, saying only that the matter was under investigation and that further reporting would follow.