Amaechi said he was attacked at an event on climate change held in Madrid, Spain.
The minister disclosed this on his Twitter handle, @ChibuikeAmaechi.
He said Spanish policemen succeeded in stopping his attackers before they could hurt him.
He did not disclose the identities of his attackers.
Recall that the immediate past Deputy President of the Senate, Ike Ekweremadu, in August, confirmed a physical assault on him by some members of the Indigenous Peoples of Biafra in Nuremberg, Germany,
Ekweremadu confirmed the attack in a statement released by his Media Assistant, Uche Anichukwu, in Abuja.
The senator, who also gave account of the event on his social media handle @iamekweremadu, also said that he was safe.
He condemned the attack and said he had immediately reported it to the Nigerian Ambassador to Germany, Mr. Yusuf Tuggar.
Ekweremadu had said, “I attended the Second Annual Cultural Festival and Convention organised by Ndi-Igbo Germany in Nurnberg today where I was billed to give a keynote address along with the President-General of Ohanaeze Ndigbo, Chief Nnia Nwodo, who, however could not make it eventually.
“I was given a resounding welcome by Ndigbo in Germany and everything went smoothly until some men, who identified themselves as IPOB members stormed the venue and began to complain about the killings in the South East, stressing that there would be no Igbo event at the venue.
“I tried to engage them, but when they became unruly, I had to leave the venue. The organisers also invited the police and I was accompanied out of the venue.
“Much as I am disappointed in their conduct, especially as I am one of the persons who have spoken up on justice for Ndigbo, the Python Dance, judicial killings in Igbo land and elsewhere both on the floor of the Senate and in my written and personal engagements with the Presidency and the media as well as rallied the South East Senate Caucus to secure Mazi Nnamdi Kanu’s release with Senator Enyinnaya Abaribe taking him on bail to douse tension in the South East, I nevertheless do not hold this to heart against them, for they know not what they do.”