An American woman was gang-raped Tuesday in the northern Indian resort town of Manali, police said.

Police officer Sher Singh said while the woman, 30, was hitchhiking back to her guest house after visiting a friend, men in a truck picked her up.

They made a pit stop to a isolated area where the three men raped her.  After the incident, the woman went to the police to file a rape case.

There has been no arrest as of yet, but authorities issued alerts and set roadblocks to check trucks that are leaving town.

This rape case has come after a pattern of sexual assaults in India.  

In March, a Swiss tourist was gang-raped during a cycling trip across rural India.  Six men were apprehended for that attack.

That same month in northern India, a British woman jumped out of a third-floor hotel window in fear of being sexually assaulted by the hotel's owner who made a forceful attempt to get in her room.

These dangerous encounters all followed a December attack of a woman who was gang-raped on a moving bus in New Delhi.

These cases have triggered protestors to fight in effort to gain more protection for women.  As a result, prison terms for rape have lengthened, the death penalty has been enforced to rapists who leave their victims dead or in a coma, and voyeurism; stalking; acid attacks; and trafficking of women are now punishable under criminal law.