** Shares of Tuas TUA.AX down 3.9% at A$2.4 after shedding as much as 10% earlier in day
** Co says it has terminated agreement with Singapore's Keppel KPLM.SI to buy its stake in mobile operator M1 via unit Simba Telecom in a deal worth S$1.43 billion ($1.12 billion)
** On Monday, TUA ended nearly 63% lower after Singapore's regulator suspended its review of the deal due to an investigation into the radio frequency bands that Simba could have been using
** TUA has shed 63% so far in the week, set to log its biggest weekly drop on record
** About 5.5 million shares change hands, 2.6x 30-day average
** Stock down 67.9% this year, including day's move
($1 = 1.2785 Singapore dollars)
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com))