Outrage is building over an effigy of Gauteng Education MEC Panyaza Lesufi that was placed outside the national education department's offices.

Lesufi, who has been criticised on social media for his perceived stance against Afrikaans language schools‚ says he is being harassed and threatened by rightwingers.

"These morons came to our offices to 'hang' me! We defeated your racists grandparents‚ you are nothing!‚" he tweeted.

"Yes‚ they proudly 'hanged' me‚" he said‚ in response to a question from a Twitter user.