Saudi Arabia has arrested 93 people suspected of belonging to Islamic State (IS) and foiled several plots, the interior ministry has announced.

The official Saudi Press Agency reported that the arrests had taken place since December and that the suspects included 65 Saudi nationals.

The group had set up training sites in a remote area of the al-Qassim region and planned suicide bombings, it added.

Among the alleged targets was the US embassy in the capital, Riyadh.

The Gulf kingdom is part of a US-led coalition carrying out air strikes against IS militants, who control controls a large swath of Syria and Iraq.

The Saudi authorities also announced last year heavy penalties for anyone travelling abroad to fight for or showing support for the jihadist group.