Parts of Great Suffolk Street and Pocock Street were closed off by police on Sunday morning after reports of an assault.
The police cordon also included Pakeman House.
A New Scotland Yard spokesman said that the male victim's injuries – believed to include a knife wound – were not thought to be life-threatening or life-changing.
For the latest local news and events direct to your inbox every Monday, you need our weekly email newsletter SE1 Direct.
7,000+ locals read it every week. Can you afford to miss out?
Read the latest issue before signing up