Police have warned against revenge attacks after a Saudi Arabian woman was stabbed to death on a footpath in Colchester.
Student Nahid Almanea, 31, died after she was stabbed 16 times on Tuesday morning, Essex Police said.
Essex Police called for calm, saying they were aware threats of revenge attacks had been made on social media sites.
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After a relatively mild and quiet night, an episode of rain for many of us tomorrow.
The 34-year-old from Coulsdon in Surrey died during the private party in Headley in the early hours of Monday, Surrey Police said.
The Home Office made the arrests at various restaurants across London on July 4.