By Hyunjoo Jin and Joyce Lee
SEOUL, Feb 17 (Reuters) - Samsung Group chief Jay Y. Lee was arrested early on Friday over his alleged role in a corruption scandal rocking the highest levels of power in South Korea, dealing a fresh blow to the world's biggest maker of smartphones and memory chips.
The 48-year-old Lee, scion of the country's richest family, was taken into custody at the Seoul Detention Centre after waiting there overnight for the decision. He was being held in a single cell with a TV and desk, a jail official said.
Shares in flagship Samsung Electronics Co Ltd opened down 1.2 percent, while shares in Samsung C&T Corp, the de facto holding company of Samsung Group, opened down 3.2 percent compared with the wider market's drop of 0.45 percent.
No decision had been made on whether Lee's arrest would be contested or whether bail would be sought, a spokeswoman for Samsung Group said.
Samsung and Lee have denied wrongdoing in the case.
"We will do our best to ensure that the truth is revealed in future court proceedings," the Samsung Group said in a brief statement after Lee's arrest.
The same court had rejected a request last month to arrest Lee, but prosecutors on Tuesday brought additional accusations against Lee, seeking his arrest on bribery and other charges.
"We acknowledge the cause and necessity of the arrest," a judge said in his ruling, citing the extra charges and evidence.
The judge rejected the prosecution's request to arrest Samsung Electronics president Park Sang-jin. The rulings were announced at about 5:30 a.m. (2030 GMT), more than 10 hours after Lee had left the court.
While Lee's detention is not expected to hamper day-to-day operation of Samsung firms, which are run by professional managers, experts said it could hinder strategic decision-making by South Korea's biggest conglomerate.
Samsung has been in the midst of an ongoing restructuring to clear a succession path for Lee to assume control after his father was incapacitated by a heart attack in 2014.
Decisions that could be complicated by Lee's arrest include deliberations over whether to reorganize the group under a holding company structure, as well as its plan to abandon its future strategy office, or "control tower," a central decision-making body that came in for criticism during the scandal.
Staff moves have also been in limbo. Samsung, which employs more than 250,000 people, has yet to announce annual personnel promotions and changes, which it typically does in December.
"Until a ruling is given, it's going to be difficult to decide these important matters," said Park Ju-gun, head of research firm CEO Score.
Lee's incarceration comes as Samsung Electronics tries to get past the disastrous roll out last year of its Galaxy Note 7 smartphones, which were prone to fires. It is under pressure for the upcoming launch of its next flagship phone, the Galaxy S8, to be a success.
"This is a painful event for Vice Chairman Lee," said Kim Sang-jo, a shareholder activist and economics professor at Hansung University who was questioned by the special prosecutor as a witness in the probe.
"But this will be an important opportunity for Samsung Group to sever ties with the past," he said, referring to links between the government and the country's conglomerates, also known as chaebol.
Lee's arrest gives a boost to prosecutors who have zeroed-in on Samsung Group to build their case against President Park and her close friend Choi Soon-sil, who is in detention and faces charges of abuse of power and attempted fraud.
Both Park and Choi have denied wrongdoing.
Prosecutors have focused on Samsung's relationship with Park, 65, accusing the group of paying bribes totaling 43 billion won ($37.74 million) to organizations linked to Choi to secure government backing for the 2015 merger of two Samsung units.
If parliament's impeachment is upheld by the Constitutional Court, an election would be held in two months. In the meantime, Park remains in office but stripped of her powers.
Her would-be successors praised the decision to arrest Lee.
"We hope it marks a beginning to end our society's evil practice of cozy ties between government and corporations and move towards a fair country," said Kim Kyoung-soo, a spokesman for Moon Jae-in, a member of the liberal opposition Democratic Party who is leading opinion polls in the presidential race.
(Additional reporting by Ju-min Park and Cynthia Kim; Writing by Tony Munroe; Editing by Lincoln Feast) ((firstname.lastname@example.org; 82-2-3704-5685; Reuters Messaging: email@example.com))
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