In a statement, the United Nations human rights office also said it had obtained "verified video footage" showing security forces firing on protesters, apparently with intent to kill.
"This is the worst political crisis the regime has faced in its 40 years", he told reporters at the U.S. State Department on Wednesday.
Hook also announced Thursday that the U.S. will offer $15 million for information on the whereabouts and activities of an Iranian commander based in Yemen, who he said "has a long history of attacks against Americans and our allies globally, " including a planned effort to assassinate the Saudi Arabian ambassador to the United States in 2011. There are nearly certainly more, but the exact number is not publicly known, in part because their families have been reluctant to publicize the cases for fear of angering Iranian authorities.
The State Department is denouncing the latest attempts by Iran's Ayatollah regime to crack down on anti-government protests across the country.
"All in all, the picture now emerging from Iran is extremely disturbing", Bachelet said.
The Islamic Revolutionary Guard Corps said on Saturday that it was investigating reports that its forces had targeted and shot protesters, the semi-official Iranian Labour News Agency reported, citing Brigadier General Mohammadreza Yazdi.
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Iran has dismissed the high death tolls as "utter lies" and confirmed only five dead - four security force personnel killed by "rioters" and one civilian. "The Iranian people want the regime to focus on investing in people, not proxies".
Bachelet charged that "many of the arrested protesters have not had access to a lawyer", while raising alarm over "reports of severe overcrowding and harsh conditions in detention centres, which in some cities include military barracks, sports venues and schools".
Trump, who has close ties with Saudi Arabia and Israel, has tried to block all Iranian oil exports after withdrawing past year from a denuclearization deal, vowing to reduce Iran's clout in around the Middle East.
Ambassadors from Britain, Germany and France, which still back the deal, said Iran's missile program is capable of delivering nuclear bombs in a letter to the UN Security Council. He said Iranian officials are trying to hide the true scale of the protests.
Iranian Foreign Minister Mohammad Javad Zarif said earlier the prisoner swap was imminent.
These were serious violations of human rights, Bachelet said.