Indian police Saturday were investigating two highly publicized gang-rape cases—one in the commercial city Mumbai, the other in the eastern state of Jharkhand—highlighting the country's struggles with sexual violence.

In Jharkhand, police said they had detained five suspects in connection with the rape of a policewoman by a group of men who had set up a roadblock on a highway. The attack occurred Thursday, but wasn't reported to police until Friday, they said.

Two men were in custody and three others were being sought by police Saturday in the Mumbai case, in which a 22-year-old magazine intern taking photographs of dilapidated buildings was assaulted in an abandoned textile mill in the city.

The attacks come as the trial of five people accused in the December gang rape and murder of a 23-year-old student on a Delhi bus entered its final phase. That crime sparked nationwide demonstrations and prompted the government to introduce harsher penalties for crimes against women.

Protesters took to the streets of Mumbai on Friday to decry the gang-rape of a woman in a city that has a reputation as a relatively safe place for women. In 2012, the incidence of rape in the Western Indian metropolis was about half the national rate, according to the National Crime Records Bureau.