Three parcels apparently containing human faeces have been sent to the office and home of commerce minister Greg So Kam-leung, who has been the subject of protests after he called for tolerance of mainland parents who allow their children to relieve themselves in Hong Kong streets.
All of the packages were accompanied by typed messages making reference to So's earlier remarks, according to police, who are investigating.
News of the parcels - one of which was opened by So's wife - followed a demonstration outside his home on Sunday in which protesters used fake excrement to simulate urination and defecation.
So, in Paris on government business, yesterday described the acts as "very unwise".
"I hope that everyone can express themselves in civilised and rational ways," he said.
The first two parcels were delivered to So's office at government headquarters in Admiralty and his home on MacDonnell Road on Tuesday last week, a few days after he urged Hongkongers to teach mainlanders manners instead of pointing accusatory fingers at them. The third was received at his office on Monday.
Each parcel contained a letter and a bag of what is believed to be human faeces, So said in a statement last night.
A source close to the situation said the second parcel was addressed to his wife.
A police source said officers believed the three parcels were sent at the same time and the finger-sized pieces of solid waste were believed to be human.
So's call for tolerance came amid a public backlash against mainland tourists triggered by a video posted online showing a mainland couple allowing their toddler to urinate and defecate on a busy Mong Kok street.
The minister was on a business tour to Chongqing when the first two parcels were received and has been at a meeting of the Organisation for Economic Co-operation and Development's ministerial council since Tuesday. A police source said he had not come into contact with any of the parcels.
A police spokesman said the investigation was being handled by a Central District team. No arrests had been made last night.