Gardaí investigating an alleged conspiracy to murder a Swedish cartoonist are continuing to question three people.

The three are part of a group of seven people arrested in Waterford and Cork on Tuesday.

Earlier, a woman who had also been questioned was released without charge.

Yesterday, gardaí released a husband and wife from Algeria and a Libyan woman.

Files relating to the three are being prepared for the Director of Public Prosecutions.

The arrests on Tuesday morning were part of an international investigation into death threats against Swedish cartoonist Lars Vilks.

He was threatened over a drawing that depicted the Prophet Muhammad with the body of a dog.