Kandiah Sarveshwaran, education minister of the Tamil- majority northern province, had last week refused to raise the national flag at an official ceremony held in the town of Vavuniya.
"We will investigate and take appropriate action," main opposition leader R Sampanthan of the Tamil National Alliance said, adding "He has no reason to disrespect the national flag".
Sarveshwaran had said that the lion in the national flag only reflects the majority Sinhalese and its other features do not recognise the island's Tamil minority.
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