IOS:app crash due to memory warning - objective-c

Question

My app gets crashed, when I am loading profile with thumbnail picture in UITableView.
It loads up to 5 profiles with picture properly. But, when I am creating sixth one, then loading profile in table view with picture it gets crashed, showing me the memory warning message.
Actually I have used ARC. So, I am not able to release the memory. I am only able to use the autoreleasepool to realease the memory.
Below is code I am using to load the profile in UITableView with profile picture.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
#autoreleasepool
{
static NSString *CellIdentifier=#"Cell";
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
}
MyProfile * objMP1 = [GlobalgroupedProfileArray objectAtIndex:[indexPath row]];
NSString *titleText =[#"Name: " stringByAppendingString:objMP1.Name];
cell.textLabel.text=titleText;
NSString *strTitle1=[#"Owner: "stringByAppendingString:[objMP1.Owner stringByAppendingString:#"\n"]];
NSString *strTitle2=[#"Breed: "stringByAppendingString:[objMP1.Breed stringByAppendingString:#"\n"]];
NSString *strTitle=[[strTitle1 stringByAppendingString:strTitle2] stringByAppendingString:[#"ID Number: "stringByAppendingString:[NSString stringWithFormat:#"%#",objMP1.IDNumber]]];
cell.detailTextLabel.text=strTitle;
cell.detailTextLabel.numberOfLines =3;
#autoreleasepool
{
UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(cell.frame.size.width-70-25, 15, 50, 50)];
imageView.image = objMP1.img;
[cell addSubview:imageView];
imageView=nil;
}
#autoreleasepool
{
// Load the image with an GCD block executed in another thread
dispatch_queue_t downloadQueue = dispatch_queue_create("image downloader", NULL);
dispatch_async(downloadQueue, ^{
CGSize newSize = CGSizeMake(50, 50); //whaterver size
UIGraphicsBeginImageContext(newSize);
[objMP1.img drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
dispatch_async(dispatch_get_main_queue(), ^{
#autoreleasepool
{
UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(cell.frame.size.width-70-25, 15, 50, 50)];
imageView.image = newImage;
[cell addSubview:imageView];
imageView=nil;
}
});
});
dispatch_release(downloadQueue);
}
[cell.imageView setImage:newImage];
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
}
Any Hints?