Activist: 3 detained in Bahrain over UK horse show protests

The King of Bahrain Hamad bin Isa Al Khalifa, laughs as he stands with Britain's Queen Elizabeth II as they attend the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Windsor England Friday May 12, 2017. (Nick Ansell/PA via AP) (The Associated Press)

Britain's Queen Elizabeth II and the King of Bahrain Hamad bin Isa Al Khalifa attending the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Windsor England Friday May 12, 2017. (Nick Ansell/PA via AP) (The Associated Press)

Britain's Queen Elizabeth II, speaks with the King of Bahrain Hamad bin Isa Al Khalifa, right, as Britain's Prince Andrew looks on while they attend the Royal Windsor Horse Show, which is held in the grounds of Windsor Castle in Windsor England Friday May 12, 2017. (Nick Ansell/PA via AP) (The Associated Press)

An activist says three fellow campaigners have been detained in Bahrain over their protests targeting the tiny island nation's king during a horse show in the United Kingdom.

Sayed Alwadaei, the director of advocacy at the Bahrain Institute for Rights and Democracy, said the arrests happened Saturday. He says those detained include his sister.

The detentions come as activists have been protesting King Hamad bin Isa Al Khalifa's presence at the Royal Windsor Horse Show taking place in Britain. Already, state-run Bahrain News Agency photographs have shown King Hamad there with Queen Elizabeth II and Dubai ruling family members.

Bahrain is in the midst of a major crackdown on dissent, years after its rulers crushed its 2011 Arab Spring protests. Authorities did not immediately respond to a request for comment.