The report says that the aid began during Operation Cast Lead and had remained for five years since then.
The Hamas government is strongly protesting this.
Israel had not restricted any imports of medicines or medical equipment to Gaza (although certain types of equipment sometimes take a few extra days for special permission.)
It appears that Hamas' complaint is that the cash-strapped government doesn't want to pay for these things itself and prefers to have the extra $3 million to be able to buy rockets and build kidnapping tunnels.
In the past, Hamas has confiscated donated medicines from NGOs and governments and sold them for a profit.
I didn't see any announcement on the ICRC webpage about this.