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estão investigando

are investigating

→ estar
phrase Uncommon #19,433
are investigating Uses estar + gerund to describe an action currently in progress. The subject is often omitted and understood from context; estão indicates a plural subject, while the person may vary in other forms.
PO: As autoridades estão investigando o caso.
EN: The authorities are investigating the case.

Estão investigando o problema.

They are investigating the problem.

As autoridades ainda estão investigando.

The authorities are still investigating.

Estão investigando um sequestro, não as fitas.

They are investigating a kidnapping, not the tapes.

— Caché (2005)

Eles estão investigando o problema.

They are investigating the problem.

Os cientistas estão investigando por que a experiência falhou.

Scientists are investigating why the experiment failed.

Estão investigando, mas ê um milagre.

They're investigating, but it's a miracle.

— Tudo Sobre Minha Mãe (1999)

Estão investigando as armas que os americanos deram a Chongqing.

They are investigating the weapons that the Americans gave to Chongqing.

— Desejo e Perigo (2007)

Os detetives ainda estão investigando.

The detectives are still investigating.