President Donald Trump and first lady Melania Trump are marking 24 years since the Sept. 11, 2001, attacks at a service at the Pentagon on Thursday.

The remembrances are being held during a time of increased political tensions. The 9/11 anniversary, often promoted as a day of national unity, comes a day after conservative activist Charlie Kirk was shot and killed while speaking at a college in Utah.

Here's the latest:

FBI releases photos of person of interest in Kirk shooting as investigators appeal to public

The sniper who assassinated Charlie Kirk is believed to have jumped off a roof and fled into a neighborhood after firing one shot and has not been identified, authorities said Thursday in disclosing they have recovered a high-powered, bolt-action rifle they believe was used

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