Technical and logistical problems mean Peruvians choosing a new president and members of Congress continue to vote on Monday.
Hundreds of Alianza Lima fans had gathered for a pregame rally ahead of a match against local rivals Universitario de Deportes.
The author is best known for his novel A World for Julius, which chronicles the frivolous lives of the elite.
The military helicopter was supporting search and rescue operations in the Arequipa region on Sunday.
José María Balcázar is chosen by Congress after his predecessor was ousted over graft allegations, which he denies.
José Jerí is the third consecutive president to be removed and the country's seventh since 2016.
Tourist Niels Honkoop says shattered glass littered the carriage floor and injured people were lying in the aisles.
A train driver died and at least 40 people were injured in the crash on the single-track line to Machu Picchu.
Rescue efforts in Peru's central Ucayali region are being hindered by strong currents on the river, one official said.
