GUIYANG -- Police have arrested suspects in a fatal explosion at a gambling den in Southwest China's Guizhou province, said local authorities on Thursday.

Two suspects, both surnamed Yang, allegedly conspired to commit robbery after setting off a bomb at a gambling site on a remote mountain slope in Laoshan village of Kaili city, according to the provincial public security department.

Fifteen people were killed in the blast, which occurred at 2:40 pm on Jan 13. Another seven people were injured.

The casualties were people who had gathered at the site to gamble.

Eight detained as village blast toll rises to 15	Police probe SW China gambling den blast