Police Commissioner Mike Bush said the four arrested people comprised three men and one woman.
US prosecutors on Sunday slapped the gunman who killed 11 people in a synagogue in Pittsburgh with 29 counts of federal crimes of violence and firearms offenses.
A loyal and old gunman of Ram Rahim, he was admitted in a Dera Sacha Sauda hospital.
Attack on Military Parade in Iran Kills at least 30 leaving many injured
The incident took place at Santa Fe High School in the city of the same name, located about 50 kilometres southeast of Houston.
The three female victims were employees of the nonprofit organisation Pathway Home treatment program, which is housed on the campus of the Veterans Home of California-Yountville.
Belgian police sealed off part of a Brussels suburb Thursday, warning residents to stay inside amid media reports that an armed man could be at large.
Long Beach police on Friday called the shooting "workplace violence." They said on Twitter that it has become a murder investigation, and that the suspect is also dead at the scene.
Authorities and other officials in the small town of Aztec near the Colorado border have released few details other than to say the shooter and two victims attended Aztec High School.
The gunman, identified as Henry Bello, was found dead of a self-inflicted gunshot wound on the 17th floor of the hospital.
Houston: A man came into a Houston auto detail shop and began shooting, killing a man known to be a customer and putting a neighborhood on lockdown Sunday before being killed by a SWAT officer,
Belfair (US) : A gunman killed four people in a home in rural Washington state before fatally shooting himself after an hourslong standoff, authorities have said.The gunman yesterday called authorities to say he shot and
Jerusalem: A gunman opened fire at a popular bar in the central Israeli city of Tel Aviv on Friday afternoon, killing two people and wounding at least three others before fleeing the scene, police said.The
Louisiana (AP): An official with an ambulance service in the city of Lafayette, Louisiana, says that a shooting at a movie theater has left three people dead, including the gunman.Clay Henry is vice president
Sousse, Tunisia: A young man unfurled an umbrella and pulled out a Kalashnikov, opening fire on European sunbathers in an attack that killed at least 28 people at a Tunisian beach resort — one of
El Paso Texas: A gunman opened fire at a veterans' medical clinic in West Texas on Tuesday, killing one person, officials said. The gunman was also killed.Investigators, who took no questions from reporters during a
Washington: US President Barack Obama today appealed to fellow Americans to reject violence and words that harmed others and turn to words that heal, hours after a lone black gunman killed two uniformed New York
Canberra: Australian Prime Minister Tony Abbott confirmed on Tuesday that the gunman at the centre of the Sydney siege, in which two hostages were shot dead, was known to the federal police and had an
Ottawa: A gunman who stormed Canada's parliament after killing a soldier at a nearby war memorial was a petty criminal fighting a drug addiction and was estranged from his family, reports said today.Michael Zehaf-Bibeau, 32,