BLOUNTVILLE (AP) — Investigators in Tennessee worked all night Wednesday and into Thursday morning in the search for a 15-month-old girl who hasn’t been seen since the day after Christmas.

Evelyn Mae Boswell was reported missing Tuesday, but was last seen Dec. 26, 2019, the Tennessee Bureau of Investigation told news outlets.

It’s unclear why the girl wasn’t reported missing until weeks after her disappearance.

An Amber Alert was issued Wednesday, according to a tweet from the TBI Wednesday.

Officials were following up on several tips but there hadn’t been any major developments as of Thursday morning, said Capt. Andy Seabolt of the Sullivan County Sheriff’s Office.