The activists damaged a gate and then tried to force their way into the main building of the institute at Karolinska University Hospital in Solna at around 8.30am on Monday.
“Staff managed to lock the main entrance so that the activists were unable to enter the building,” said police spokesman Björn Engström to newspaper Dagens Nyheter.
The activists then made their way to St. Eriksplan metro station.
Police followed the activists and identified the offenders who are suspected of criminal trespass on a protected site and criminal damage.
Metro services were temporarily interrupted at the St.Eriksplan station to prevent the activists’ escape.