Amsterdam - Four men arrested in Kenya for allegedly plotting terror attacks were released from detention in the Netherlands on Friday - pending further investigation by the Dutch authorities.

The quartet - three Dutch-Moroccans and a Moroccan with Dutch residency, all aged 21 - were arrested in July near the Kenyan border with Somalia.

They were allegedly on their way to a jihadist training camp in Somalia. All four were deported to Belgium, and then extradited to the Netherlands.

"We have not yet received any information from Kenya concerning their alleged terrorist activities, public prosecutor spokesman Wim de Bruin told the German Press Agency dpa.

"Therefore we have no legal grounds to extend their detention,"

The four, who have been in police custody for one month, were released "without restriction" while the authorities would continue their investigation, the spokesman said.

Dutch police said the four were members of a small group in The Hague, monitored by the intelligence services, with allegedly jihadist views. (dpa)