  We present results of 3 mm observations of SiO maser sources in the Galactic
Centre (GC) from observations with the Australia Telescope Compact Array
between $2010-2014$, along the transitions of the SiO molecule at $v = 1, J =
2-1$ at 86.243 GHz and $v = 2, J = 2-1$ at 85.640 GHz. We also present the
results of the 3 mm observations with Atacama Large Millimeter/Submillimeter
Array (ALMA). We detected 5 maser sources from the ATCA data, IRS 7, IRS 9, IRS
10EE, IRS 12N, and IRS 28; and 20 sources from the ALMA data including 4 new
sources. These sources are predominantly late-type giants or emission line
stars with strong circumstellar maser emission. We analyse these sources and
calculate their proper motions. We also study the variability of the maser
emission. IRS 7, IRS 12N and IRS 28 exhibit long period variability of the
order of $1 - 2$ years, while other sources show steady increase or decrease in
flux density and irregular variability over observation timescales. This
behaviour is consistent with the previous observations.
