The Canadian Museum for Human Rights is reviewing its security procedures after the downtown Winnipeg site was broken into early this morning.

Police have jointly charged two teenage girls, aged 15 and 17, and a 16-year-old boy and a 21-year-old man with breaking and entering to commit mischief, as well as theft under $5,000.

Officers were called to the museum, which is under construction, at around 2:30 a.m. CT Tuesday on reports of a break-in in progress.

The four were arrested in the area, police said in a release.

Museum spokesperson Angela Cassie said the building was locked and security staff were on site at the time.

"Exactly how they gained access is under investigation, but we do know that security was able to bring this to the police's attention and it resulted in an arrest very nearby to the site," she told CBC News.

Museum staff are looking at how security could be enhanced, she added.

Damage from the break-in appears to be minor, Cassie said, adding that staff are glad that no one was hurt given that the area is an active construction site.