Detectives are looking for six men after a fight broke out at a Cardiff Bay restaurant.
Emergency services were called to Las Iguanas in Mermaid Quay at around 8.20pm on Wednesday evening, where four men had been sitting.
Two other men ran into the restaurant on Tacoma Square and threw a liquid at them, alleged to have been a corrosive substance.
Furniture was also picked up and thrown before both groups ran out of the restaurant.
No one was injured, and according to police, the substance involved in the incident was not harmful.
A cordon was put in place with the public urged to avoid the area, but it was lifted by 11pm.
But it's understood the six men had also been involved in another altercation in another part of Mermaid Quay at around 6.15pm.
South Wales Police are treating the incident at the restaurant as a targeted attack - and they are appealing for witnesses or anyone who was in Mermaid Quay at the time of the incident to come forward.
Detective Inspector Phil Marchant said: "We acknowledge the considerable public concern following this incident however no injuries have been reported and at this time the liquid is not believed to have been harmful."
He added: “Inquiries are ongoing to identify and locate all six men.”
"Officers would like to speak with anyone who was in Las Iguanas, or the vicinity of Tacoma Square, between 6.15pm and 8.30pm who may have information that could assist their inquiries."
Anyone with information should contact South Wales Police on 101 or use the live web chat, quoting reference no. 2400378983.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.

Council to review use of GP letters as evidence for disability claims
Plans have been put in place to redevelop a complex with more than 20 flats
Vale Council Reaccredited Under White Ribbon Scheme as Part of Ongoing Work to Tackle Violence Against Women and Girls
Two Vale Restaurants Among Those Set to Close as Whitbread Shuts Brewers Fayre and Beefeater Chains
Vale Council Issues Safety Warning After Gas Canisters Found in Household Recycling
Police Appeal for Witnesses After Early‑Morning Affray in Barry
Cogan Primary School Praised for its Inclusive Culture and Strong Leadership in Estyn Inspection
Senedd Members Call to Tackle Substance Use Stigma
Calls for Welsh Government to Match England's Pub Business Rates Cut
Caerdydd Penarth MS backs campaign to make rail station more accessible
Barry Waterfront Regeneration Project Moves a Step Closer
Age Cymru Responds to VAT cut to household electricity bills
Old Post Office in St Brides Major could be converted into a new house and set of flats
Kanishka Narayan retains AI Minister role as Burnham Signals Early Priorities
Victorian Building on Broad Street could become a new daycare centre
Barry to Host First-Ever Street Art Festival This August
Barry entrepreneur named finalist in major UK awards recognising top business leaders
New Barry watersports facility and housing
Man charged after Skomer Road assault