Police have cordoned off a section of a residential street off Nacton Road in Ipswich.
Officers were pictured attending an incident in Beatty Road at around 6pm on Thursday.
A spokesman for Suffolk police declined to provide further details of the incident.
However, the spokesman said there was no threat to the wider public.
Suffolk police later confirmed that a 17-year-old boy had been stabbed and two other teenagers had been arrested.
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