Clinics have begun closing in several U.S. states after a Supreme Court ruling on Friday stripped American women of their constitutional right to abortion.
About half of the US states are expected to impose new restrictions or bans after the court overturned its 50-year ruling known as "Roe v Wade".
In 13 states there are so-called incentive laws that will ban abortion within 30 days.
President Joe Biden described the decision as "a tragic mistake".
In Phoenix, Arizona, police fired tear gas after pro-abortion protesters stormed the doors and windows of the state capital.
"Police used tear gas after a crowd of protesters repeatedly knocked on the doors and windows of the State Senate building," Arizona Department of Public Safety spokesman Bart Graves told CNN.
In Los Angeles, protesters briefly blocked traffic on a highway.
Protests are expected to continue Saturday in many cities across the country.
President Joe Biden has asked the Secretary of Health to ensure that women can receive abortion pills and other medications approved by the Food and Drug Administration, the White House announced.