The provincial government organized an investigation after the blast, and a number of suspects have been detained.
The rail project, which will connect Southwest China with Laos by 2021, is part of the two countries' efforts to promote interconnectivity.
The protesters also hurled gasoline bombs into Tung Chung Station and set fires in Heng On Station.
The province was one of the country's most underdeveloped regions when China ramped up targeted relief efforts in 2012 to eradicate absolute poverty before 2020.
The pullout also came as the Trump administration faces intense criticism for its recently introduced policy that separates children from parents who were arrested for illegally crossing from Mexico into the United States.
The proposal comes as China's modernization drive picks up speed and the economy shifts toward high-quality development.
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The railway route connects the two economic circles of the Beijing-Tianjin-Hebei region and the Yangtze River Delta region. The maximum operation speed of the line is 350 kilometers per hour at present.
The purchasing managers' index for China's non-manufacturing sector came in at 53.4 in November, down from 53.9 in October, the National Bureau of Statistics said.
The purchase is the biggest ever single asset deal in British property market.
The province saw a total grain output of 75.05 billion kg in 2018, accounting for over 10 percent of the country's total grain output, according to the National Bureau of Statistics.