TAIYUAN -- Explosions that left one person dead and eight injured on Wednesday morning in North China's Shanxi province were caused by self-made bombs, local police said.

The blasts struck at around 7:40 am in front of the office building of the Shanxi Provincial Committee of the Communist Party of China, on Yingze Street in the provincial capital of Taiyuan, according to the city's public security bureau.

Eight explosive sounds were heard. An Explosive Ordnance Disposal team was dispatched to the scene while no other explosive was discovered.

The presence of steel beads and circuit boards found scattered at the scene by an initial investigation indicate the incident was caused by self-made bombs, according to police.

Traffic at the site has been resumed, and further investigation into the case is under way.