Litter scattered around Hoan Kiem Lake imcluded plastic bags, bottles and cups.
Dustbins were overloaded, causing the rubbish to spill onto streets.
Plastic bags on Le Thai To Street
A pile of rubbish on Dong Kinh Nghia Thuc Square
Litter covers a tree stump.
Many shops and street stalls around Hoan Kiem Lake were open until early Friday morning.
The huge amount of litter gave environmental workers a heavy workload and it meant they had to work to around 2 am on Friday.