を捜している

is looking for

→ を
phrase Rare #36,690
is looking for Used after the person or thing being searched for. 捜す often suggests searching for someone or something that is missing or difficult to find.
JA: 母は眼鏡を捜している。
EN: My mother is looking for her glasses.

警察は行方不明書類を捜している

The police are searching for the missing documents.

警察がを捜している

The police are looking for me.

彼は新しい職を捜している

He is looking for a new job.

彼女は自分の車の鍵を捜している

She is looking for her car keys.