People visit Jacksonville Beach, Fla., on April 25 after some beaches and parks reopened during the coronavirus pandemic. (Charlotte Kesl/Charlotte Kesl for The Washington Post)

The number of U.S. residents showing “quarantine fatigue” by venturing out increased last week, when more governors reopened businesses closed for the coronavirus pandemic or announced plans to do so, according to researchers tracking smartphone data.

Researchers say the cellphone location data for April 24 is significant because it marked the second Friday in a row when people stayed home less, illustrating the start of a trend rather than a one-week blip.