D.C. police are investigating three violent robberies this week in which some victims were attacked with stun guns and others beaten near the Washington Convention Center in Mount Vernon Square, according to authorities.

Police said they believe that the same group of three males was responsible for all of the holdups, which happened along N Street in Northwest, between Ninth and 14th streets, on Sept. 23 and 24. After the victims, who were Hispanic men, were shocked by the stun guns, some were assaulted further, Detective Lt. John Haines said at a news conference.

“These suspects should be considered very dangerous. They have no regard for the people they are targeting,” Haines said.

The first robbery occurred a few minutes after 2 a.m. Monday in the 1200 block of N Street NW, a block south of Logan Circle. The victims — a man and his cousin — were walking when they were confronted by three men, two armed with handguns, another with a stun gun, said Officer Araz Alali, a department spokesman.

The victims tried to run but were caught. One received an electric shock and the other was hit in the face, Alali said. One of the victims was also robbed of his wallet, containing $300, and his iPhone. One victim was treated at a hospital, Alali said.

About 4:30 p.m. the same day, police said, a man was grabbed near 14th and N streets and pulled into an alley. Alali said the victim was punched in the head by one assailant while a second man reached into the victim’s pocket and took his wallet. One suspect had a stun gun and the other a knife, police said.

In the third attack, a man told police that a car slowed next to him about 5:20 a.m. Tuesday while he was walking in the 900 block of N Street. A man got out of the car, shocked him with a stun gun and punched him. A second man also got out of the car and grabbed the victim’s wallet, cellphone and backpack, police said.

Police did not have a detailed description of the suspects because the victims were disoriented during the attacks, Haines said.