Police officials couldn't be immediately reached for comment.
As of 4.45am, police cars remained in the vicinity of Najib's bungalow in the leafy district of Jalan Duta, near Kuala Lumpur, along with a "Black Mariah" - a police wagon used to transport detainees. The events were being streamed live on Facebook by local media and one account had attracted almost 8000 viewers.
Pakatan Harapan (PH), the centre-left coalition that is now led by 92-year-old former prime minister Mahathir Mohamad, won 48% of the vote against the BN's 34% in last week's poll, gaining a substantial parliamentary majority and 57 additional seats.
The raid indicates that Najib's role in the 1MDB scandal is a key focus of the reopened investigation into the billions of embezzled funds.
A lawyer for Najib, who was ousted from office in last week's general election, said police seized handbags and a few other personal items from Najib's home in connection with a money laundering probe.
PKR de factor leader Datuk Seri Anwar Ibrahim believes that his release from prison was due to the efforts and struggles of his supporters for the past 20 years.
The scandal is being investigated by police in at least six countries, including the United States.
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"Gani claimed that he was preparing to charge Najib that morning but he was deprived of his position", he told a press conference here yesterday. However, the relationship between the two remains volatile, and will largely determine what course Malaysia will chart in the coming months.
For now, Anwar, whose wife, Wan Azizah Wan Ismail, is the new deputy prime minister, says he wants to spend time with his family, rest, and carry out some speaking engagements.
Anwar, 70, was convicted of sodomy in 2015 in a case he said was aimed at crushing his alliance, which was making gains against Malaysia's long ruling coalition government.
After being sworn in as Malaysia's seventh prime minister last Thursday, Mahathir moved swiftly to name new finance, home affairs and defense ministers but has not appointed a full Cabinet amid horse trading among his four-party alliance for posts. His release clears the way for him to return to politics, but it is unlikely he will take over as prime minister anytime soon.
Anwar was jailed for sodomy and corruption. "Nothing serious. About two, three boxes" of them, Harpal said. "It is not easy for him to accept me and shake my hand", The Malaysia Insight quoted Mahathir as saying. "Why should I harbor any malice toward him?"
The pardon, which enables Anwar to re-enter politics immediately, was granted on the grounds that there had been a miscarriage of justice. "For this, we will contact the governments of the countries to recover the money there", Mahathir said.
"It looks very likely that Najib will face the full force of the law", said Adib Zalkapli, a Kuala Lumpur-based analyst with risk consultancy Vriens & Partners.