BOJ reduces amount of 3 to 5 years bonds it bought from prior

BOJ JGB buying operations
– Bought 1 – 3 years at same amount as previous operation
– Bought 5 – 10 years at same amount as previous operation
– But reduced purchase amount in the 3 – 5 year window, 320bn this time vs. 350 bn last time
Markets are wondering if this is some sort of ‘taper’ from the Bank of Japan, The BOJ did tell us they would be purchasing at the odd smaller amount in April (announced so at the end of March)