Three children were reported to be seriously injured but stable.
As an expression of his dissatisfaction, Xicheng district said, Jia wielded a hammer that he normally used for work to injure students during a class.
A doctor at the hospital posted on social media: "The mayor today came to the hospital to wait with us while the children were being medically treated". His contract was set to expire this month and had not been renewed.
A relative escorts a child from an elementary school where an attack took place in Beijing.
A film of a meeting between school staff and parents circulated widely on social media, in which parents were told a "school worker" had carried out the attack.
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The unnamed man is said to have targeted the youngsters around 11.15am local time at the school in the Xicheng district.
"The details are still not clear", wrote one parent on WeChat.
The attacker, originally from northeastern Heilongjiang province, has been detained by police and an investigation was under way, state television said.
Outside the school gates Tuesday afternoon, parents who were there to pick up their kids said they had received little information about the attack.
According to cellphone video taken by a parent at a school briefing following the incident and seen by Sixth Tone, all of the students are second-graders.
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The 39-year-old assailant slashed students while they were returning to the classroom after morning exercises.
In November 2018, five people were killed when a auto was driven into a crowd of children outside a kindergarten in the northeast of the country.
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