Boston Police say that thieves targeting people carrying smartphones are responsible for a string of street robberies in Area C-11 in recent days.

According to a statement released by police on Tuesday, four incidents have taken place since Nov. 2 in different sections of the district, which covers the eastern side of Dorchester.

In the most recent incident, a woman was approached from behind by two suspects as she walked from the JFK-UMass station on Sydney Street just after midnight on Sunday, Nov. 17. “The victim stated she felt something hard on the back of her head and the males demanded the victim’s money and cell phone,” police reported. “The victim complied with the suspects’ demands.”

In another incident on Nov. 2, another female victim was also approached by a single male suspect who brandished a pair of scissors and demanded her property. The suspect took the victim’s iPhone5. On Nov. 4, officers were called to 750 Washington Street after a male victim was robbed at knife point.

The unknown male assailant made off with his iPod Touch. On Nov. 6, another victim was robbed of his iPhone by two males near Rowena Street and Ashmont Street. One of the two suspects brandished a knife in the robbery.

The Boston Police Department urges anyone with information to contact Area C-11 detectives at 617-343-4335.