Gwent Police say the 15-year-old girl from Newbridge was arrested on suspicion of threats to kill, possession of a bladed article on a school premises and conspiracy to commit murder.
The 14-year-old girl from Risca was arrested on suspicion of conspiracy to commit murder.
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The dairy started 36 years ago and was one of the UK’s largest dairy companies but said it has experienced "significant cash flow issues".
Alongside his teammate Mason Bennett, Lawrence has been banned from driving for two years.
Takeshi Koike learnt the language when he came to Lampeter, Ceredigion, as part of his studies in 1992.