Two weeks have passed since the claimed the lives of eight people, and in that time at least 20 other mass shootings have taken place.

The incidents have stretched from California to Washington, D.C., and many have left multiple victims dead.

At least seven mass shootings occurred in the week between the attacks in Atlanta and in . In the week that followed, that number more than doubled.

CNN defines a mass shooting as a shooting incident that results in four or more casualties (dead or wounded), excluding the shooter(s).

MARCH 31: ORANGE, CALIFORNIA

were killed and another person wounded in a mass shooting at an office complex in Orange, California, according to authorities.

MARCH 31: WASHINGTON, D.C.

Five people were shot in Washington, The incident started as a dispute and ended with two people dead and three injured.

MARCH 28: CLEVELAND, OHIO

Seven people were shot at a Cleveland nightclub, according to The victims, four men and three women, were all between 20 and 30 years old, and police believe several shooters fired inside the nightclub, the station reported.

MARCH 28: CHICAGO, ILLINOIS

Four people in an SUV were shot on the I-57 expressway, according to. All were taken to hospitals in critical condition.

MARCH 28: ESSEX, MARYLAND

A man fatally shot his parents before shooting three people at a convenience store, killing two of them, The suspect died by suicide.

MARCH 27: CHICAGO, ILLINOIS

Four people were shot in Chicago's South Austin neighbourhood, according to . The victims, which included men ages 42, 53 and 64, were all near a sidewalk when they were shot, the station reported.

MARCH 27: YAZOO CITY, MISSISSIPPI

At least seven people were injured in a mass shooting at a nightclub, reported. At least six people were shot and another person suffered a laceration, the station reported.

MARCH 27: RIVER GORGE, ILLINOIS

A shooting on a party bus left three people injured and one dead, according to Police say the occupants of another vehicle fired at the bus while stopped at an intersection, the station reported.

MARCH 26: VIRGINIA BEACH, VIRGINIA

Three in the city left eight people injured and two dead, according to the Officers responded to shots fired and found the eight victims, who were transported to local hospitals with gunshot wounds ranging from serious to life-threatening. Officers heard additional gunshots nearby and found a female victim who died of injuries from gunshot wounds.

The suspected gunman succumbed to his wounds after a related officer-involved shooting, the city said.

MARCH 26: CHICAGO, ILLINOIS

A gathering in Chicago's Wrightwood neighborhood turned into a mass shooting, according to . Two gunmen opened fire inside the gathering, wounding seven people and fatally shooting a 26-year-old man, the station reported.

MARCH 26: NORFOLK, VIRGINIA

Police responded to a shooting that left four people wounded, reported. The victims -- two 18-year-old men, a 17-year-old girl and a 21-year-old woman -- sustained non-life-threatening gunshot wounds.

MARCH 26: MEMPHIS, TENNESSEE

Five people were shot in Memphis, Three victims were pronounced dead at the scene, two were transported to the hospital in critical condition and one was transported in non-critical condition, the tweet said.

MARCH 26: PHILADELPHIA, PENNSYLVANIA

Outside of the Golf and Social Club, police say two suspects shot seven people, Video released by police shows two suspects approaching a gathering crowd and opening fire.

MARCH 23: ALICEVILLE, ALABAMA

A shooting reported at an Aliceville home left two people dead and two injured, according to

MARCH 23: BOULDER, COLORADO

Ten people, including a Boulder police officer, were at the King Soopers supermarket, according to police.

MARCH 20: PHILADELPHIA, PENNSYLVANIA

One person was killed and another five were injured during a shooting at an illegal party, CNN affiliate KYW reported. "There were at least 150 people in there that fled and believed they had to flee for their lives," Philadelphia Police Commissioner Danielle Outlaw said.

MARCH 20: DALLAS, TEXAS

Eight people were shot, one fatally, by an unknown assailant,

MARCH 20: HOUSTON, TEXAS

Five people were shot after a disturbance inside a club, One was in critical condition after being shot in the neck, the rest were in stable condition, according to

MARCH 18: GRESHAM, OREGON

Four victims were taken to the hospital after a shooting in the city east of Portland,

MARCH 17: STOCKTON, CALIFORNIA

Five people who were preparing a vigil in Stockton, in California's Central Valley, were shot in a drive-by shooting, the. None had life-threatening injuries.

MARCH 16: ATLANTA, GEORGIA

Eight people, including , were killed when a White gunman stormed three spas, police said.