Beijing — A series of bombs packed with ball bearings exploded outside a provincial headquarters of China's ruling Communist Party on Wednesday, killing at least one person days after a fiery attack in Tiananmen Square.

Police and state media gave no possible motive for the blasts in Taiyuan, capital of the northern province of Shanxi. Disgruntled citizens have staged several incidents elsewhere in the country in recent years.

The bombings came a little over a week after a fatal car crash described by authorities as a "terrorist attack" at the symbolic heart of the Chinese state, and days ahead of a highly anticipated meeting of top party leaders in Beijing.

"There were several explosions caused by small explosive devices near the party provincial commission in Taiyuan," local police said on a verified social media account.