After facing flak in international tea markets, the Assam government has asked tea garden owners to give a written pledge not to engage child labourers or face action under anti-child labour laws. Minister for welfare of tea tribes and labour Pallab Lochan Das told The Telegraph here that garden owners and tea planters have been issued notices following which a few gardens submitted in writing that they would not engage child labour. But the labour department was awaiting replies from a majority of gardens.