ANTIOCH -- Three shootings in as many days in the Sycamore Drive neighborhood has residents on edge, as police investigate whether the incidents are connected.

One of Antioch's densest neighborhoods, the Sycamore area has not been immune to gunfire over the years -- police in 2011 said the area accounts for 15 percent of the city's violent crime. But with no arrests and two shooting victims in three days, including one riding a bicycle, there's growing concern among residents.

"You can only hope it's a one-time thing, it's a fluke, because if it really is going to be the way it is there's got to be more crackdown," said longtime resident David Rubio, 56. "People are going to be afraid to come to this area."

The latest gunfire erupted Wednesday at 8:45 p.m., when someone shot up a car in the 2200 block of Sycamore. No one was hurt, Lt. Robin Kelley said.

A day earlier, at 9:40 p.m. Tuesday, a 33-year-old man was shot while riding his bicycle on Mahogany Way and Mandarin Way, near Contra Loma Estates Park. He is expected to survive.

On Monday evening, a shooting on the 1500 block of Sycamore Drive left a 21-year-old man in serious condition. Witnesses told police the gunman left in a four-door Buick sedan.

Hours earlier and across Highway 4, a 24-year-old was shot at 11:46 a.m. at Hudson Court and Fairview Avenue, near Somersville Towne Center.

Police do not believe the two shootings on Monday were related but continue to investigate whether the others are. No arrests have been made.

Anyone who has information about the shooting is asked to contact the Antioch Police Department at 925-779-6926 or text a tip to 274637 and include the word ANTIOCH.

"It's dangerous for people to live here because stray bullets are stray bullets," Rubio said.

David DeBolt covers breaking news. Contact him in Richmond at 510-262-2728. Follow him at Twitter.com/daviddebolt.