Morocco arrested the main suspect and two other Moroccans for their role in a bomb attack in the city of Marrakesh that killed 16 people, many of them foreigners, last month, an interior ministry officials told AFP.
The main suspect "is linked to Al-Qaeda and made the bomb" that ripped through a cafe in Djemaa El-Fna Square, the tourist heart of Marrakesh, the official said.
The three Moroccans were arrested at Safi, 350 kilometres (220 miles) south of Casablanca, a security official said adding that they had a police record and were known for taking part in the recruitment of fighters for Iraq.
The April 28 attack also left 21 people injured.
