A statement released by the Metropolitan Police said: 'Police were called at 11:06hrs on Wednesday, 19 December to reports of a stabbing at a health centre on St Stephen’s Road, Tower Hamlets.
'Officers, including specialist firearms officers, attended and found three people suffering from stab injuries.'
The three people - understood to have been patients - were taken to hospital by ambulance, and have injuries that are not thought to be life-threatening.
Police said that a man had been detained close to the 13,000-patient St Stephen's Health Centre and also taken to hospital after an injury.
No information was available at the time of writing about the identity of the three people stabbed or the man detained, although police confirmed that the incident was not thought to be terror-related.
The poll found that one in three GPs had felt threatened by a patient and one in six said they or a colleague had been attacked in their practice in the past year.