A Yemeni security official says one protester has been killed and 10 people injured, including four guards, in clashes with Shiite protesters. They were demanding the release of political detainees.

The official said the Shiites, known as Hawthis, fired at guards while trying to storm intelligence headquarters in Sanaa on Sunday.

He said some protesters were arrested for smuggling weapons and drugs. He spoke on condition of anonymity according to regulations.

Also Sunday, hundreds of supporters of former president Ali Abdullah Saleh demonstrated in Sanaa against the release of 17 men who were detained in connection with a June 2011 explosion that injured Saleh in his palace mosque. Saleh stepped down last year after months of protests.

The prosecutor's office said the 17 were released for lack of evidence.