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We report on a fan-shaped set of high-speed jets above a strongly magnetizedlight bridge (LB) of a sunspot observed in the H$\alpha$ line. We study theorigin, dynamics and thermal properties of the jets using high-resolutionimaging spectroscopy in H$\alpha$ from the Swedish 1-m Solar Telescope and datafrom the Solar Dynamics Observatory and Hinode. The H$\alpha$ jets have lengthsof 7-38 Mm, are impulsively accelerated to a speed of $\sim 100$ km/s close tophotospheric footpoints in the LB, and exhibit a constant decelerationconsistent with solar effective gravity. They are predominantly launched fromone edge of the light bridge, and their footpoints appear bright in theH$\alpha$ wings. AIA data indicates elongated brightenings that are nearlyco-spatial with the H$\alpha$ jets. We interpret them as jets of at leasttransition region temperatures. The magnetic field in the light bridge has astrength of $0.8-2$ kG and it is nearly horizontal. All jet properties areconsistent with magnetic reconnection as the driver.

Fan-shaped jets above the light bridge of a sunspot driven by reconnection