Nine people have been taken into custody in connection with the oil pipeline explosion that killed 55 people in Qingdao, Shandong province, and residents still awaited solutions on Tuesday to potential danger.

Seven of the nine people detained are from Sinopec, which owns the pipeline, and two are from the Huangdao Development Zone, the zone authority announced on Monday.

Eight oil containment booms have been preventing the remaining crude oil from contaminating the sea, and the oil is being collected into storage tanks, Sinopec said.