Police have identified the gunman as a Palestinian resident of East Jerusalem.
A woman who was on the bus told reporters her husband was killed when he tried to stop the gunman.
A few hours later, a gunman opened fire on children at a summer camp on Utoya, an island north of the capital, killing at least 10 people.
The gunman sprinted to a motorcycle, where a driver was waiting for him, and hopped on the back seat. They sped away.
Carthage police chief, Chris McKenzie, told several television stations that the gunman was also injured before being apprehended by police after the shooting at Pinelake Health and Rehab centre.
The gunman is holding two children hostage in the building.
One of the victims was critically injured, the gunman fled but a suspect was arrested nearby.
Liviu Librescu, a professor of engineering science& mechanics, was killed while holding off the gunman so his students could escape.
For several hours the base was locked down and plunged into confusion, amid misplaced fears that more than one gunman was at large.
It was clear to the gunman what the police were doing at all times, not only because the whole incident was televised, but also because they moved "laboriously slowly", Mr Shoebridge says.
The gunman saw this on television, and became agitated himself.
There was no immediate official confirmation about the number of casualties or the status of the gunman.
"I was in the lobby of the hotel when gunmen came in and people started running," he said. "a gunman just stood there spraying bullets around, right next to me."
He gazed fearlessly at the gunman.
He dodged to left and right as the gunman opened fire.
Yemeni officials say a rocket attack on a British embassy vehicle in Sana 'a has wounded several people, while a gunman has killed a French man working at an energy facility outside the capital.
Some time later, a gunman entered and handed me his mobile phone.
For the first time, Jose Ramos-Horta has described how he walked into an ambush and watched as a gunman lifted his rifle to shoot him.
This mystery gunman wasn't the only felon who invested time in CPR training.
She recoiled from the gunman in terror.
Alex Chamberlen, a British citizen who was dining at the Oberoi, told Sky News that a gunman ushered 30 to 40 people from the restaurant into a stairway and ordered everyone to put up their hands.
The sight of the masked gunman made my blood freeze.
At 7.20am he heard two shots but could see neither stalker nor deer. To his horror, he realised that the gunman could be firing towards his group.
The deadly rampage in April on the campus of Virginia Tech left 32 people, and the gunman, dead.
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