A shooting incident was reported near the residence of Philippine President Rodrigo Duterte, the Presidential Security Group said.
"We are ruling out foul play", Dagoy told reporters.
"I was a lawyer then", Mr Duterte said, recalling the time the inherited land was sold.
He was due to attend several public events in Manila on Tuesday evening. More than 800 people have died in the conflict, which Duterte said was triggered by an attempt to arrest a drug personality, who he did not identify.
When asked about the president's source of information and if it has already been verified by the country's intelligence services, Lorenzana said that he was not "privy" to the information.
On the severity of the situation, Dutarte said that illegal drugs have penetrated 40 percent of the villages in the country. "I can not blame the Chinese government or the people", he added.
"We don't know the exact nature of this incident", he added.
Duterte's opinion runs counter to that of his ally, Senator Richard Gordon, chairman of the Blue Ribbon committee investigating the smuggling of P6.4-billion worth of crystal meth, or "shabu", through the Bureau of Customs, who has suggested that the country's relations with China be reconsidered if the giant state can not stem the flow of narcotics to the Philippines. This prompted congressional investigations into how such a huge amount of illegal drugs was able to escape Manila's port.
His comments come after Senator Antonio Trillanes made claims that Duterte's oldest son is a member of a Chinese drug triad.
The inquiry and the explosive revelations have already led to the resignation of Customs Commissioner Nicanor Faeldon, who is also alleged to have received millions in bribe payments.
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