Reminder for a meeting ?

Could you kindly help me with the following e-mail , i sent e-mail to all departments regarding a meeting which will be held at 9:00 tomorrow , due to a security briefing from 8:30 i will need to send e-mails for rescheduling the meeting with 15 minutes .

"dear Colleagues,

This is a kind reminder for today`s meeting , kindly note that the meeting will be slightly postponed as per details:

Xdate,time,place

Thank you for your understanding and apologies for any inconvenience this may cause/have caused

Kind Regards"

could you kindly advise how i can write it better and to explain that the meeting will be postponed due to the training that will be conducted, and to apologies for any inconvenience this may cause.

Thank you very much.