Danish police on Wednesday apprehended activist Greta Thunberg at a Copenhagen protest against the war in Gaza, a spokesperson for the student group organizing the demonstration said.A police spokesperson told Reuters that six people were detained at the scene at Copenhagen University after some 20 people blocked the entrance to a building and three entered.Police declined to confirm the identities of those arrested, but a spokesperson for the Students Against the Occupation told Reuters that Thunberg had been held.A picture of Thunberg published by the daily Ekstra Bladet showed Thunberg wearing what the newspaper said were handcuffs.