''My heart goes out to the people there,'' McGrath told the 'Sunday Telegraph'.
''When I saw that on the news I didn't even think of cricket, I just thought of the people,'' he added, expressing his shock at the attack, which claimed nearly 200 lives and left 700 injured.
The Aussie gave strong indications that with the health of his wife Jane improving rapidly, he would be making a comeback to international cricket with the Champions Trophy.
''Cricket-wise, I can think of no better preparation for the Ashes than a six-week build-up on the flat sub-continent wickets.
That will be all the workout I need leading up to the Ashes,'' he said.
Buoyed by the support he received from former greats Richard Hadlee and Allan Donald, McGrath said the praise has raised his confidence and he will travel to Brisbane this week for a workout at the Australian Cricket Academy.
The veteran revealed having talks with coach John Buchanan and Cricket Australia to plan out his return.
''Things are going really well at home and Jane continues to improve each day,'' McGrath said.
''She is more than happy for me to get back into some serious work. I've been doing plenty of indoor work and everything has been feeling great. Now it's time to build up with some extra sessions outdoors,'' he added.
Hadlee and Donald have expressed confidence that the seamer would be better then ever on his return to the international arena and McGrath said he would do his level best to live upto the faith being shown in him.
''It's great to hear positive things from people who know what the game is all about, as opposed to the opinions of a few who are less informed,'' McGrath said responding to the comments made by Hadlee and Donald.
''They are all quality fast bowlers - two of the greatest ever - and that level of support has given me a lift,'' he added.