(CNN) — President Donald Trump has said that a suspect is in custody related to the killing of Charlie Kirk .

“I think with a high degree of certainty we have him in custody,” Trump said during an appearance on Fox News’ “Fox and Friends.”

Kirk, a conservative political activist and ally of the president’s, died after being shot at an event at Utah Valley University earlier this week.

According to four sources familiar with the matter, a person is in custody and being questioned in connection to the fatal shooting. The person is still being questioned as of Friday morning, the sources said.

Two of the sources said that the man confessed to his father that he was the shooter. His father told authorities and said he had secured his son until he could be formally detained.

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