One of the four sent their company a text message that said , ` ` Help me '' The four are being investigated for entering a military zone without authorization . They also may have videotaped military targets , Chinese state media reports . Beijing has made escalating diplomatic threats against them over a separate matter .
One of the four sent their company a text message that said , `` Help me '' The four are being investigated for entering a military zone without authorization . They also may have videotaped military targets , Chinese state media says . Beijing has made escalating diplomatic threats against Tokyo over a separate arrest .