They wrote following announcement
"Update:
We have identified several IPs that appear to be involved and will open a case. Total BTC equivalent lost from the hot wallets was 9.8 BTC. All of the team members here have pooled personal coins to recoup as much of the losses as we can. If you would like to make a donation to the recoup fund, please send BTC to 1MNLR51z8nGR86DokPDq49QM2CbNuzEoxA - anything is appreciated.
Please withdraw all coins immediately. If you need your daily limit raised, please send an email to poswallet.verify@gmail.com with your username and request. Moving forward, the team here is going to focus on building new wallet technology for the POSW wallet. Marking coins for delisting now.
All term deposits have been refunded with interest.
We had a malicious intrusion into at least one wallet server in the past 12hrs. All withdrawals are pending manual review until we verify that the wallets are secure.
Initial wallet balance survey shows 9.3 BTC worth of coins have been stolen. We are already in contact with the authorities with respect to this and are providing all server information that we have.
We suggest withdrawing your coins - please understand there will be delay while we manually process withdrawals."
It's not clear, but nearly 100+ coins delisted 3-4 months ago. I already have equivalent balances from delisted coins on their info and it's not look like normal for me!
It reminds me samething about coinwallet.co
EDIT
Strange thing is users have a time up to 1 October 2017 for withdrawal and posw already decreased 30%
It seems it's time to buy :)